diff --git a/satpy/etc/composites/goci2.yaml b/satpy/etc/composites/goci2.yaml
new file mode 100644
index 0000000000..818c88c3a6
--- /dev/null
+++ b/satpy/etc/composites/goci2.yaml
@@ -0,0 +1,148 @@
+sensor_name: visir/goci2
+
+
+modifiers:
+
+  rayleigh_corrected:
+    modifier: !!python/name:satpy.modifiers.PSPRayleighReflectance
+    atmosphere: us-standard
+    aerosol_type: rayleigh_only
+    prerequisites:
+    - name: 'L660'
+      modifiers: [sunz_corrected]
+    optional_prerequisites:
+    - satellite_azimuth_angle
+    - satellite_zenith_angle
+    - solar_azimuth_angle
+    - solar_zenith_angle
+
+  rayleigh_corrected_marine_clean:
+    modifier: !!python/name:satpy.modifiers.PSPRayleighReflectance
+    atmosphere: us-standard
+    aerosol_type: marine_clean_aerosol
+    prerequisites:
+    - name: 'L660'
+      modifiers: [sunz_corrected]
+    optional_prerequisites:
+    - satellite_azimuth_angle
+    - satellite_zenith_angle
+    - solar_azimuth_angle
+    - solar_zenith_angle
+
+  rayleigh_corrected_marine_tropical:
+    modifier: !!python/name:satpy.modifiers.PSPRayleighReflectance
+    atmosphere: tropical
+    aerosol_type: marine_tropical_aerosol
+    prerequisites:
+    - name: 'L660'
+      modifiers: [sunz_corrected]
+    optional_prerequisites:
+    - satellite_azimuth_angle
+    - satellite_zenith_angle
+    - solar_azimuth_angle
+    - solar_zenith_angle
+
+  rayleigh_corrected_desert:
+    modifier: !!python/name:satpy.modifiers.PSPRayleighReflectance
+    atmosphere: tropical
+    aerosol_type: desert_aerosol
+    prerequisites:
+    - name: 'L660'
+      modifiers: [sunz_corrected]
+    optional_prerequisites:
+    - satellite_azimuth_angle
+    - satellite_zenith_angle
+    - solar_azimuth_angle
+    - solar_zenith_angle
+
+  rayleigh_corrected_land:
+    modifier: !!python/name:satpy.modifiers.PSPRayleighReflectance
+    atmosphere: us-standard
+    aerosol_type: continental_average_aerosol
+    prerequisites:
+    - name: 'L660'
+      modifiers: [sunz_corrected]
+    optional_prerequisites:
+    - satellite_azimuth_angle
+    - satellite_zenith_angle
+    - solar_azimuth_angle
+    - solar_zenith_angle
+
+
+composites:
+  true_color:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: 'L660'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected]
+    - name: 'L555'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected]
+    - name: 'L443'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected]
+    standard_name: true_color
+
+  true_color_land:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: 'L660'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_land]
+    - name: 'L555'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_land]
+    - name: 'L443'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_land]
+    standard_name: true_color
+
+  true_color_desert:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: 'L660'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_desert]
+    - name: 'L555'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_desert]
+    - name: 'L443'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_desert]
+    standard_name: true_color
+
+  true_color_marine_clean:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: 'L660'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_marine_clean]
+    - name: 'L555'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_marine_clean]
+    - name: 'L443'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_marine_clean]
+    standard_name: true_color
+
+  true_color_marine_tropical:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: 'L660'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_marine_tropical]
+    - name: 'L555'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_marine_tropical]
+    - name: 'L443'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected_marine_tropical]
+    standard_name: true_color
+
+  true_color_raw:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: 'L660'
+      modifiers: [effective_solar_pathlength_corrected]
+    - name: 'L555'
+      modifiers: [effective_solar_pathlength_corrected]
+    - name: 'L443'
+      modifiers: [effective_solar_pathlength_corrected]
+    standard_name: true_color
+
+  ocean_color:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: 'L660'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected]
+    - name: 'L555'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected]
+    - name: 'L443'
+      modifiers: [effective_solar_pathlength_corrected, rayleigh_corrected]
+    standard_name: ocean_color
diff --git a/satpy/etc/readers/goci2_l1_nc.yaml b/satpy/etc/readers/goci2_l1_nc.yaml
new file mode 100644
index 0000000000..0d4c0a7377
--- /dev/null
+++ b/satpy/etc/readers/goci2_l1_nc.yaml
@@ -0,0 +1,204 @@
+reader:
+  name: goci2_l1_nc
+  short_name: GOCI-II L1 NetCDF4
+  long_name: GK-2B GOCI-II Level 1 products in netCDF4 format from NOSC
+  status: Beta
+  supports_fsspec: true
+  sensors: ['goci2']
+  reader: !!python/name:satpy.readers.yaml_reader.GEOSegmentYAMLReader
+  # file pattern keys to sort files by with 'satpy.utils.group_files'
+  group_keys: ['start_time', 'platform_shortname', "slot"]
+
+file_types:
+    goci2_l1:
+        file_reader: !!python/name:satpy.readers.goci2_l1_nc.GOCI2L1NCFileHandler
+        file_patterns:
+         - '{platform:3s}_{sensor:5s}_{processing_level:3s}_{acquisition_date:%Y%m%d}_{acquisition_time:%H%M%S}_{coverage:2s}_S{slot:3d}_G{segment:3d}.nc'
+         - '{platform:3s}_{sensor:5s}_{processing_level:3s}_{acquisition_date:%Y%m%d}_{acquisition_time:%H%M%S}_{coverage:2s}_S{slot:3d}.nc'
+
+
+datasets:
+# --- Navigation Data ---
+  latitude:
+    name: latitude
+    file_type: goci2_l1
+    file_key: latitude
+    standard_name: latitude
+    units: degrees_north
+
+  longitude:
+    name: longitude
+    file_type: goci2_l1
+    file_key: longitude
+    standard_name: longitude
+    units: degrees_east
+
+# --- Radiance Data ---
+  L380:
+    name: L380
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_380
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L412:
+    name: L412
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_412
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L443:
+    name: L443
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_443
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L490:
+    name: L490
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_490
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L510:
+    name: L510
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_510
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L555:
+    name: L555
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_555
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L620:
+    name: L620
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_620
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L660:
+    name: L660
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_660
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L680:
+    name: L680
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_680
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L709:
+    name: L709
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_709
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L745:
+    name: L745
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_745
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
+  L865:
+    name: L865
+    wavelength: [0.450, 0.470, 0.490]
+    resolution: 250
+    file_type: goci2_l1
+    file_key: L_TOA_865
+    coordinates: [longitude, latitude]
+    calibration:
+      radiance:
+        standard_name: toa_outgoing_radiance_per_unit_wavelength
+        units: W m-2 um-1 sr-1
+      reflectance:
+        standard_name: toa_bidirectional_reflectance
+        units: "%"
diff --git a/satpy/readers/goci2_l1_nc.py b/satpy/readers/goci2_l1_nc.py
new file mode 100644
index 0000000000..ecca586c6d
--- /dev/null
+++ b/satpy/readers/goci2_l1_nc.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# Copyright (c) 2023 Satpy developers
+#
+# This file is part of satpy.
+#
+# satpy is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software
+# Foundation, either version 3 of the License, or (at your option) any later
+# version.
+#
+# satpy is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# satpy.  If not, see <http://www.gnu.org/licenses/>.
+"""Reader for GK-2B GOCI-II L1 products from NOSC.
+
+For more information about the data, see: <https://www.nosc.go.kr/eng/boardContents/actionBoardContentsCons0028.do>
+
+The L1 data products from NOSC do not contain solar irradiance factors, which are necessary to transform
+radiance to reflectance. The reader hardcodes these values based on calculation from `pyspectral`:
+```
+from pyspectral.utils import convert2wavenumber, get_central_wave
+from pyspectral.rsr_reader import RelativeSpectralResponse
+from pyspectral.solar import SolarIrradianceSpectrum
+
+goci2 = RelativeSpectralResponse("GK-2B", "goci2")
+rsr, info = convert2wavenumber(goci2.rsr)
+solar_irr = SolarIrradianceSpectrum(dlambda=0.0005, wavespace="wavenumber")
+for band in goci2.band_names:
+    print(f"Solar Irradiance (GOCI2 band {band}) = {solar_irr.inband_solarirradiance(rsr[band]):12.6f}")
+```
+
+"""
+
+import logging
+from datetime import datetime
+
+import xarray as xr
+
+from satpy.readers.netcdf_utils import NetCDF4FileHandler
+
+logger = logging.getLogger(__name__)
+
+GOCI2_SOLAR_IRRAD = {"L380": 15.389094,
+                     "L412": 29.085551,
+                     "L443": 37.377115,
+                     "L490": 46.492590,
+                     "L510": 48.745104,
+                     "L555": 57.122588,
+                     "L620": 65.075606,
+                     "L660": 67.138780,
+                     "L680": 68.981090,
+                     "L709": 69.870426,
+                     "L745": 70.849054,
+                     "L865": 72.470692
+                     }
+
+GOCI2_SOLAR_IRRAD = {"L380": 1061.509391,
+                     "L412": 1710.525606,
+                     "L443": 1899.063039,
+                     "L490": 1931.795505,
+                     "L510": 1871.312024,
+                     "L555": 1853.857524,
+                     "L620": 1693.385039,
+                     "L660": 1541.451305,
+                     "L680": 1491.561883,
+                     "L709": 1389.725683,
+                     "L745": 1274.906171,
+                     "L865": 971.089088}
+
+class GOCI2L1NCFileHandler(NetCDF4FileHandler):
+    """File handler for GOCI-II L1 official data in netCDF format."""
+
+    def __init__(self, filename, filename_info, filetype_info, mask_zeros=True):
+        """Initialize the reader."""
+        super().__init__(filename, filename_info, filetype_info, auto_maskandscale=True)
+
+        # By default, we mask nodata areas (zero values) near the edges of the extent
+        self.mask_zeros = mask_zeros
+
+        self.attrs = self["/attrs"]
+        self.nc = self._merge_navigation_data(filetype_info["file_type"])
+
+        # Read metadata which are common to all datasets
+        self.nlines = self.nc.sizes["number_of_lines"]
+        self.ncols = self.nc.sizes["number_of_columns"]
+
+    def _merge_navigation_data(self, filetype):
+        """Merge navigation data and geophysical data."""
+        groups = ["geophysical_data", "navigation_data"]
+        return xr.merge([self[group] for group in groups])
+
+    @property
+    def start_time(self):
+        """Start timestamp of the dataset."""
+        dt = self.attrs["observation_start_time"]
+        return datetime.strptime(dt, "%Y%m%d_%H%M%S")
+
+    @property
+    def end_time(self):
+        """End timestamp of the dataset."""
+        dt = self.attrs["observation_end_time"]
+        return datetime.strptime(dt, "%Y%m%d_%H%M%S")
+
+
+    def _calibrate(self, data, bname):
+        """Convert raw radiances into reflectance."""
+        import numpy as np
+        from pyorbital.astronomy import sun_earth_distance_correction
+
+        esd = sun_earth_distance_correction(self.start_time)
+
+        factor = np.pi * esd * esd / GOCI2_SOLAR_IRRAD[bname]
+
+        res = data * np.float32(factor)
+
+        # Convert from 0-1 range to 0-100
+        res = 100 * res
+
+        res.attrs = data.attrs
+
+        res.attrs["units"] = "1"
+        res.attrs["long_name"] = "Bidirectional Reflectance"
+        res.attrs["standard_name"] = "toa_bidirectional_reflectance"
+
+        return res
+
+    def get_dataset(self, key, info):
+        """Load a dataset."""
+        var = info["file_key"]
+        logger.debug("Reading in get_dataset %s.", var)
+        variable = self.nc[var]
+
+        variable = variable.rename({"number_of_lines": "y", "number_of_columns": "x"})
+
+        # Some products may miss lon/lat standard_name, use name as base name if it is not already present
+        if variable.attrs.get("standard_name", None) is None:
+            variable.attrs.update({"standard_name": variable.name})
+        variable.attrs.update({"platform_name": self.attrs["platform"],
+                               "sensor": "goci2"})
+
+        # The data lists "0" as the valid minimum, but this is also used for fill values
+        # at the edge of the image extent. If required, filter these.
+        if self.mask_zeros:
+            variable = variable.where(variable != 0)
+
+        # If required, convert raw radiances to reflectance
+        if "calibration" in key:
+            if key["calibration"].name == "reflectance":
+                variable = self._calibrate(variable, info["name"])
+            elif key["calibration"].name != "radiance":
+                raise ValueError(f"Calibration type {key["calibration"].name} not supported.")
+
+        variable.attrs.update(key.to_dict())
+
+        variable.attrs["orbital_parameters"] = {
+            "satellite_nominal_longitude": self.attrs["sub_longitude"],
+            "satellite_nominal_latitude": 0.,
+            "projection_longitude": self.attrs["longitude_of_projection_origin"],
+            "projection_latitude": self.attrs["latitude_of_projection_origin"],
+            "projection_altitude": self.attrs["perspective_point_height"]
+        }
+        return variable