diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98c913f5758..0aa2aad6743 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Added
+
+- Add the unit `ns` to deprecated runtime metrics `process.runtime.go.gc.pause_total_ns` and `process.runtime.go.gc.pause_ns` in `go.opentelemetry.io/contrib/instrumentation/runtime`. (#7490)
+
 <!-- Released section -->
 <!-- Don't change this section unless doing release -->
 
diff --git a/instrumentation/runtime/internal/deprecatedruntime/runtime.go b/instrumentation/runtime/internal/deprecatedruntime/runtime.go
index 86c7c9e34a7..5d416b66307 100644
--- a/instrumentation/runtime/internal/deprecatedruntime/runtime.go
+++ b/instrumentation/runtime/internal/deprecatedruntime/runtime.go
@@ -179,7 +179,7 @@ func (r *runtime) registerMemStats() error {
 	// observation interval is too slow.
 	if pauseTotalNs, err = r.meter.Int64ObservableCounter(
 		"process.runtime.go.gc.pause_total_ns",
-		// TODO: nanoseconds units
+		metric.WithUnit("ns"),
 		metric.WithDescription("Cumulative nanoseconds in GC stop-the-world pauses since the program started"),
 	); err != nil {
 		return err
@@ -187,7 +187,7 @@ func (r *runtime) registerMemStats() error {
 
 	if gcPauseNs, err = r.meter.Int64Histogram(
 		"process.runtime.go.gc.pause_ns",
-		// TODO: nanoseconds units
+		metric.WithUnit("ns"),
 		metric.WithDescription("Amount of nanoseconds in GC stop-the-world pauses"),
 	); err != nil {
 		return err