diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8ac7c4..38b8fe2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
 #### [Unreleased](https://github.com/hougesen/mdsf/compare/v0.2.7...HEAD)
 
+- feat: support opa fmt [`#516`](https://github.com/hougesen/mdsf/pull/516)
 - feat: support purty [`#515`](https://github.com/hougesen/mdsf/pull/515)
 - feat: support nginxbeautifier [`#514`](https://github.com/hougesen/mdsf/pull/514)
 - feat: support cabal-fmt [`#513`](https://github.com/hougesen/mdsf/pull/513)
diff --git a/README.md b/README.md
index 98072ed..c15a3cc 100644
--- a/README.md
+++ b/README.md
@@ -184,7 +184,7 @@ mdsf init
 
 <!-- START_SECTION:supported-tools -->
 
-`mdsf` currently supports 206 commands. Feel free to open an issue/pull-request if your favorite tool is missing! 😃
+`mdsf` currently supports 207 commands. Feel free to open an issue/pull-request if your favorite tool is missing! 😃
 
 | Name                     | Command                                                                                |
 | ------------------------ | -------------------------------------------------------------------------------------- |
@@ -311,6 +311,7 @@ mdsf init
 | `npm-groovy-lint`        | `npm-groovy-lint --format PATH`                                                        |
 | `ocamlformat`            | `ocamlformat --ignore-invalid-option --inplace --enable-outside-detected-project PATH` |
 | `ocp-indent`             | `ocp-indent --inplace PATH`                                                            |
+| `opa:fmt`                | `opa fmt PATH -w`                                                                      |
 | `ormolu`                 | `ormolu --mode inplace PATH`                                                           |
 | `oxlint`                 | `oxlint --fix PATH`                                                                    |
 | `packer:fmt`             | `packer fmt PATH`                                                                      |
diff --git a/mdsf/src/tools/mod.rs b/mdsf/src/tools/mod.rs
index 5ef8142..8ec48aa 100644
--- a/mdsf/src/tools/mod.rs
+++ b/mdsf/src/tools/mod.rs
@@ -121,6 +121,7 @@ pub mod nph;
 pub mod npm_groovy_lint;
 pub mod ocamlformat;
 pub mod ocp_indent;
+pub mod opa_fmt;
 pub mod ormolu;
 pub mod oxlint;
 pub mod packer_fmt;
@@ -701,6 +702,10 @@ pub enum Tooling {
     /// `ocp-indent --inplace $PATH`
     OcpIndent,
 
+    #[serde(rename = "opa:fmt")]
+    /// `opa fmt $PATH -w`
+    OpaFmt,
+
     #[serde(rename = "ormolu")]
     /// `ormolu --mode inplace $PATH`
     Ormolu,
@@ -1165,6 +1170,7 @@ impl Tooling {
             Self::NpmGroovyLint => npm_groovy_lint::run(snippet_path),
             Self::Ocamlformat => ocamlformat::run(snippet_path),
             Self::OcpIndent => ocp_indent::run(snippet_path),
+            Self::OpaFmt => opa_fmt::run(snippet_path),
             Self::Ormolu => ormolu::run(snippet_path),
             Self::Oxlint => oxlint::run(snippet_path),
             Self::PackerFmt => packer_fmt::run(snippet_path),
@@ -1380,6 +1386,7 @@ impl AsRef<str> for Tooling {
             Self::NpmGroovyLint => "npm_groovy_lint",
             Self::Ocamlformat => "ocamlformat",
             Self::OcpIndent => "ocp_indent",
+            Self::OpaFmt => "opa_fmt",
             Self::Ormolu => "ormolu",
             Self::Oxlint => "oxlint",
             Self::PackerFmt => "packer_fmt",
diff --git a/mdsf/src/tools/opa_fmt.rs b/mdsf/src/tools/opa_fmt.rs
new file mode 100644
index 0000000..6022a28
--- /dev/null
+++ b/mdsf/src/tools/opa_fmt.rs
@@ -0,0 +1,36 @@
+use std::process::Command;
+
+use crate::{error::MdsfError, execution::execute_command, runners::CommandType};
+
+#[inline]
+fn set_opa_fmt_args(mut cmd: Command, file_path: &std::path::Path) -> Command {
+    cmd.arg("fmt");
+    cmd.arg(file_path);
+    cmd.arg("-w");
+    cmd
+}
+
+#[inline]
+pub fn run(file_path: &std::path::Path) -> Result<(bool, Option<String>), MdsfError> {
+    let commands = [CommandType::Direct("opa")];
+
+    for (index, cmd) in commands.iter().enumerate() {
+        let cmd = set_opa_fmt_args(cmd.build(), file_path);
+        let execution_result = execute_command(cmd, file_path);
+
+        if index == commands.len() - 1 {
+            return execution_result;
+        }
+
+        if let Ok(r) = execution_result {
+            if !r.0 {
+                return Ok(r);
+            }
+        }
+    }
+
+    Ok((true, None))
+}
+
+#[cfg(test)]
+mod test_opa_fmt {}
diff --git a/schemas/v0.2.7/mdsf.schema.json b/schemas/v0.2.7/mdsf.schema.json
index 1cef7ea..8bf882c 100644
--- a/schemas/v0.2.7/mdsf.schema.json
+++ b/schemas/v0.2.7/mdsf.schema.json
@@ -673,6 +673,11 @@
           "type": "string",
           "enum": ["ocp-indent"]
         },
+        {
+          "description": "`opa fmt $PATH -w`",
+          "type": "string",
+          "enum": ["opa:fmt"]
+        },
         {
           "description": "`ormolu --mode inplace $PATH`",
           "type": "string",
diff --git a/tools/opa/plugin.json b/tools/opa/plugin.json
new file mode 100644
index 0000000..9b04c48
--- /dev/null
+++ b/tools/opa/plugin.json
@@ -0,0 +1,15 @@
+{
+  "$schema": "../tool.schema.json",
+  "binary": "opa",
+  "categories": ["formatter"],
+  "commands": {
+    "fmt": ["fmt", "$PATH", "-w"]
+  },
+  "description": "Format Rego source files",
+  "homepage": "https://www.openpolicyagent.org/docs/latest/cli/",
+  "languages": ["rego"],
+  "name": null,
+  "npm": null,
+  "php": null,
+  "tests": []
+}