diff --git a/experimental/CHANGELOG.md b/experimental/CHANGELOG.md
index abec890a38..845a7e7ad6 100644
--- a/experimental/CHANGELOG.md
+++ b/experimental/CHANGELOG.md
@@ -6,6 +6,11 @@ All notable changes to experimental packages in this project will be documented
 
 ### :boom: Breaking Change
 
+* fix(exporter-logs-otlp-http): programatic headers take precedence over environment variables [#2370](https://github.com/open-telemetry/opentelemetry-js/pull/4351) @Vunovati
+* fix(exporter-logs-otlp-proto): programatic headers take precedence over environment variables [#2370](https://github.com/open-telemetry/opentelemetry-js/pull/4351) @Vunovati
+* fix(exporter-trace-otlp-http): programatic headers take precedence over environment variables [#2370](https://github.com/open-telemetry/opentelemetry-js/pull/4351) @Vunovati
+* fix(exporter-trace-otlp-proto): programatic headers take precedence over environment variables [#2370](https://github.com/open-telemetry/opentelemetry-js/pull/4351) @Vunovati
+
 ### :rocket: (Enhancement)
 
 ### :bug: (Bug Fix)
diff --git a/experimental/packages/exporter-logs-otlp-http/src/platform/node/OTLPLogExporter.ts b/experimental/packages/exporter-logs-otlp-http/src/platform/node/OTLPLogExporter.ts
index 25a1b194ab..56e4bad3d6 100644
--- a/experimental/packages/exporter-logs-otlp-http/src/platform/node/OTLPLogExporter.ts
+++ b/experimental/packages/exporter-logs-otlp-http/src/platform/node/OTLPLogExporter.ts
@@ -39,12 +39,13 @@ export class OTLPLogExporter
       timeoutMillis: getEnv().OTEL_EXPORTER_OTLP_LOGS_TIMEOUT,
       ...config,
     });
-    this.headers = {
-      ...this.headers,
-      ...baggageUtils.parseKeyPairsIntoRecord(
+    this.headers = Object.assign(
+      this.headers,
+      baggageUtils.parseKeyPairsIntoRecord(
         getEnv().OTEL_EXPORTER_OTLP_LOGS_HEADERS
       ),
-    };
+      config.headers
+    );
   }
 
   convert(logRecords: ReadableLogRecord[]): IExportLogsServiceRequest {
diff --git a/experimental/packages/exporter-logs-otlp-http/test/node/OTLPLogExporter.test.ts b/experimental/packages/exporter-logs-otlp-http/test/node/OTLPLogExporter.test.ts
index 6dac23b580..83b389628a 100644
--- a/experimental/packages/exporter-logs-otlp-http/test/node/OTLPLogExporter.test.ts
+++ b/experimental/packages/exporter-logs-otlp-http/test/node/OTLPLogExporter.test.ts
@@ -94,6 +94,18 @@ describe('OTLPLogExporter', () => {
       delete envSource.OTEL_EXPORTER_OTLP_LOGS_HEADERS;
       delete envSource.OTEL_EXPORTER_OTLP_LOGS_TIMEOUT;
     });
+
+    it('should override headers defined via env with headers defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar,bar=foo';
+      const collectorExporter = new OTLPLogExporter({
+        headers: {
+          foo: 'constructor',
+        },
+      });
+      assert.strictEqual(collectorExporter.headers.foo, 'constructor');
+      assert.strictEqual(collectorExporter.headers.bar, 'foo');
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
+    });
   });
 
   describe('getDefaultUrl', () => {
diff --git a/experimental/packages/exporter-logs-otlp-proto/src/platform/node/OTLPLogExporter.ts b/experimental/packages/exporter-logs-otlp-proto/src/platform/node/OTLPLogExporter.ts
index 53191c0625..a8cdfc4c96 100644
--- a/experimental/packages/exporter-logs-otlp-proto/src/platform/node/OTLPLogExporter.ts
+++ b/experimental/packages/exporter-logs-otlp-proto/src/platform/node/OTLPLogExporter.ts
@@ -50,7 +50,8 @@ export class OTLPLogExporter
       this.headers,
       baggageUtils.parseKeyPairsIntoRecord(
         getEnv().OTEL_EXPORTER_OTLP_LOGS_HEADERS
-      )
+      ),
+      config.headers
     );
   }
   convert(logs: ReadableLogRecord[]): IExportLogsServiceRequest {
diff --git a/experimental/packages/exporter-logs-otlp-proto/test/node/OTLPLogExporter.test.ts b/experimental/packages/exporter-logs-otlp-proto/test/node/OTLPLogExporter.test.ts
index 0810109e81..ab918c992b 100644
--- a/experimental/packages/exporter-logs-otlp-proto/test/node/OTLPLogExporter.test.ts
+++ b/experimental/packages/exporter-logs-otlp-proto/test/node/OTLPLogExporter.test.ts
@@ -92,6 +92,15 @@ describe('OTLPLogExporter - node with proto over http', () => {
       envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
       envSource.OTEL_EXPORTER_OTLP_LOGS_ENDPOINT = '';
     });
+    it('should override url defined in env with url defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = 'http://foo.bar/';
+      const constructorDefinedEndpoint = 'http://constructor/v1/logs';
+      const collectorExporter = new OTLPLogExporter({
+        url: constructorDefinedEndpoint,
+      });
+      assert.strictEqual(collectorExporter.url, constructorDefinedEndpoint);
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
+    });
     it('should add root path when signal url defined in env contains no path and no root path', () => {
       envSource.OTEL_EXPORTER_OTLP_LOGS_ENDPOINT = 'http://foo.bar';
       const collectorExporter = new OTLPLogExporter();
@@ -143,6 +152,17 @@ describe('OTLPLogExporter - node with proto over http', () => {
       envSource.OTEL_EXPORTER_OTLP_LOGS_HEADERS = '';
       envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
     });
+    it('should override headers defined via env with headers defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar,bar=foo';
+      const collectorExporter = new OTLPLogExporter({
+        headers: {
+          foo: 'constructor',
+        },
+      });
+      assert.strictEqual(collectorExporter.headers.foo, 'constructor');
+      assert.strictEqual(collectorExporter.headers.bar, 'foo');
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
+    });
   });
 
   describe('export', () => {
diff --git a/experimental/packages/exporter-trace-otlp-http/src/platform/node/OTLPTraceExporter.ts b/experimental/packages/exporter-trace-otlp-http/src/platform/node/OTLPTraceExporter.ts
index e4d3273239..aeb3b94ca7 100644
--- a/experimental/packages/exporter-trace-otlp-http/src/platform/node/OTLPTraceExporter.ts
+++ b/experimental/packages/exporter-trace-otlp-http/src/platform/node/OTLPTraceExporter.ts
@@ -49,6 +49,7 @@ export class OTLPTraceExporter
       ...baggageUtils.parseKeyPairsIntoRecord(
         getEnv().OTEL_EXPORTER_OTLP_TRACES_HEADERS
       ),
+      ...config.headers,
     };
   }
 
diff --git a/experimental/packages/exporter-trace-otlp-http/test/node/CollectorTraceExporter.test.ts b/experimental/packages/exporter-trace-otlp-http/test/node/CollectorTraceExporter.test.ts
index 3de60027dc..e9af4ec37b 100644
--- a/experimental/packages/exporter-trace-otlp-http/test/node/CollectorTraceExporter.test.ts
+++ b/experimental/packages/exporter-trace-otlp-http/test/node/CollectorTraceExporter.test.ts
@@ -118,6 +118,15 @@ describe('OTLPTraceExporter - node with json over http', () => {
       envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
       envSource.OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = '';
     });
+    it('should override url defined in env with url defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = 'http://foo.bar';
+      const constructorDefinedEndpoint = 'http://constructor/v1/traces';
+      const collectorExporter = new OTLPTraceExporter({
+        url: constructorDefinedEndpoint,
+      });
+      assert.strictEqual(collectorExporter.url, constructorDefinedEndpoint);
+      envSource.OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = '';
+    });
     it('should add root path when signal url defined in env contains no path and no root path', () => {
       envSource.OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = 'http://foo.bar';
       const collectorExporter = new OTLPTraceExporter();
@@ -177,6 +186,17 @@ describe('OTLPTraceExporter - node with json over http', () => {
       envSource.OTEL_EXPORTER_OTLP_TRACES_HEADERS = '';
       envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
     });
+    it('should override headers defined via env with headers defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar,bar=foo';
+      const collectorExporter = new OTLPTraceExporter({
+        headers: {
+          foo: 'constructor',
+        },
+      });
+      assert.strictEqual(collectorExporter.headers.foo, 'constructor');
+      assert.strictEqual(collectorExporter.headers.bar, 'foo');
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
+    });
     it('should use compression defined via env', () => {
       envSource.OTEL_EXPORTER_OTLP_COMPRESSION = 'gzip';
       const collectorExporter = new OTLPTraceExporter();
diff --git a/experimental/packages/exporter-trace-otlp-proto/src/platform/node/OTLPTraceExporter.ts b/experimental/packages/exporter-trace-otlp-proto/src/platform/node/OTLPTraceExporter.ts
index 210a16145a..be115583cd 100644
--- a/experimental/packages/exporter-trace-otlp-proto/src/platform/node/OTLPTraceExporter.ts
+++ b/experimental/packages/exporter-trace-otlp-proto/src/platform/node/OTLPTraceExporter.ts
@@ -52,6 +52,7 @@ export class OTLPTraceExporter
       ...baggageUtils.parseKeyPairsIntoRecord(
         getEnv().OTEL_EXPORTER_OTLP_TRACES_HEADERS
       ),
+      ...config.headers,
     };
   }
 
diff --git a/experimental/packages/exporter-trace-otlp-proto/test/node/OTLPTraceExporter.test.ts b/experimental/packages/exporter-trace-otlp-proto/test/node/OTLPTraceExporter.test.ts
index c0a604ce90..b18c5a39de 100644
--- a/experimental/packages/exporter-trace-otlp-proto/test/node/OTLPTraceExporter.test.ts
+++ b/experimental/packages/exporter-trace-otlp-proto/test/node/OTLPTraceExporter.test.ts
@@ -103,6 +103,15 @@ describe('OTLPTraceExporter - node with proto over http', () => {
       envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
       envSource.OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = '';
     });
+    it('should override url defined in env with url defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = 'http://foo.bar/';
+      const constructorDefinedEndpoint = 'http://constructor/v1/traces';
+      const collectorExporter = new OTLPTraceExporter({
+        url: constructorDefinedEndpoint,
+      });
+      assert.strictEqual(collectorExporter.url, constructorDefinedEndpoint);
+      envSource.OTEL_EXPORTER_OTLP_ENDPOINT = '';
+    });
     it('should add root path when signal url defined in env contains no path and no root path', () => {
       envSource.OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = 'http://foo.bar';
       const collectorExporter = new OTLPTraceExporter();
@@ -155,6 +164,17 @@ describe('OTLPTraceExporter - node with proto over http', () => {
       envSource.OTEL_EXPORTER_OTLP_TRACES_HEADERS = '';
       envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
     });
+    it('should override headers defined via env with headers defined in constructor', () => {
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = 'foo=bar,bar=foo';
+      const collectorExporter = new OTLPTraceExporter({
+        headers: {
+          foo: 'constructor',
+        },
+      });
+      assert.strictEqual(collectorExporter.headers.foo, 'constructor');
+      assert.strictEqual(collectorExporter.headers.bar, 'foo');
+      envSource.OTEL_EXPORTER_OTLP_HEADERS = '';
+    });
   });
 
   describe('export', () => {