diff --git a/experimental/CHANGELOG.md b/experimental/CHANGELOG.md
index c1762a1da63..e7126be0f78 100644
--- a/experimental/CHANGELOG.md
+++ b/experimental/CHANGELOG.md
@@ -29,6 +29,7 @@ All notable changes to experimental packages in this project will be documented
 
 ### :house: (Internal)
 
+* chore(instrumentation-grpc): remove unused findIndex() function [#5372](https://github.com/open-telemetry/opentelemetry-js/pull/5372) @cjihrig
 * refactor(otlp-exporter-base): remove unnecessary isNaN() checks [#5374](https://github.com/open-telemetry/opentelemetry-js/pull/5374) @cjihrig
 
 ## 0.57.0
diff --git a/experimental/packages/opentelemetry-instrumentation-grpc/src/utils.ts b/experimental/packages/opentelemetry-instrumentation-grpc/src/utils.ts
index 3cfbfc1f55d..002a2da3355 100644
--- a/experimental/packages/opentelemetry-instrumentation-grpc/src/utils.ts
+++ b/experimental/packages/opentelemetry-instrumentation-grpc/src/utils.ts
@@ -23,21 +23,6 @@ import type { IgnoreMatcher } from './types';
 export const URI_REGEX =
   /(?:([A-Za-z0-9+.-]+):(?:\/\/)?)?(?<name>[A-Za-z0-9+.-]+):(?<port>[0-9+.-]+)$/;
 
-// Equivalent to lodash _.findIndex
-export const findIndex: <T>(args: T[], fn: (arg: T) => boolean) => number = (
-  args,
-  fn
-) => {
-  let index = -1;
-  for (const arg of args) {
-    index++;
-    if (fn(arg)) {
-      return index;
-    }
-  }
-  return -1;
-};
-
 /**
  * Convert a grpc status code to an opentelemetry SpanStatus code.
  * @param status