diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16148eeae6..be8305e728 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Changelog
 
 ## master / unreleased
+* [ENHANCEMENT] Query Frontend: Log `X-Grafana-User` header in query stats, slow query, and query request logs when Grafana's `send_user_header` is enabled. #7797
 * [FEATURE] Engine: Add `-querier.selector-batch-size` and `-ruler.selector-batch-size` flags to configure series batching in the Thanos promQL engine. 0 disables batching. #7763
 * [CHANGE] Querier: Make query time range configurations per-tenant: `query_ingesters_within`, `query_store_after`, and `shuffle_sharding_ingesters_lookback_period`. Uses `model.Duration` instead of `time.Duration` to support serialization but has minimum unit of 1ms (nanoseconds/microseconds not supported). #7160
 * [CHANGE] Cache: Setting `-blocks-storage.bucket-store.metadata-cache.bucket-index-content-ttl` to 0 will disable the bucket-index cache. #7446
diff --git a/pkg/frontend/transport/handler.go b/pkg/frontend/transport/handler.go
index 432f63c2cd..623c8ae507 100644
--- a/pkg/frontend/transport/handler.go
+++ b/pkg/frontend/transport/handler.go
@@ -372,13 +372,18 @@ func (f *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 func formatGrafanaStatsFields(r *http.Request) []any {
 	// NOTE(GiedriusS): see https://github.com/grafana/grafana/pull/60301 for more info.
 
-	fields := make([]any, 0, 4)
+	fields := make([]any, 0, 6)
 	if dashboardUID := r.Header.Get("X-Dashboard-Uid"); dashboardUID != "" {
 		fields = append(fields, "X-Dashboard-Uid", dashboardUID)
 	}
 	if panelID := r.Header.Get("X-Panel-Id"); panelID != "" {
 		fields = append(fields, "X-Panel-Id", panelID)
 	}
+	// X-Grafana-User is sent by Grafana when [dataproxy] send_user_header is enabled.
+	// See https://github.com/grafana/grafana/pull/15998 for more info.
+	if grafanaUser := r.Header.Get("X-Grafana-User"); grafanaUser != "" {
+		fields = append(fields, "X-Grafana-User", grafanaUser)
+	}
 	return fields
 }
 
diff --git a/pkg/frontend/transport/handler_test.go b/pkg/frontend/transport/handler_test.go
index 71dda04280..2a66a7c7b0 100644
--- a/pkg/frontend/transport/handler_test.go
+++ b/pkg/frontend/transport/handler_test.go
@@ -519,6 +519,11 @@ func TestReportQueryStatsFormat(t *testing.T) {
 			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 samples_scanned=0 user_agent=Grafana`,
 			source:      requestmeta.SourceAPI,
 		},
+		"should include grafana user header": {
+			header:      http.Header{"X-Grafana-User": []string{"admin"}},
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 samples_scanned=0 X-Grafana-User=admin`,
+			source:      requestmeta.SourceAPI,
+		},
 		"should include engine type": {
 			header:      http.Header{http.CanonicalHeaderKey(engine.TypeHeader): []string{string(engine.Thanos)}},
 			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 samples_scanned=0 engine_type=thanos`,
@@ -634,6 +639,15 @@ func TestReportSlowQueryFormat(t *testing.T) {
 			},
 			expectedLog: `level=info msg="slow query detected" method=GET host=localhost:8080 path=/prometheus/api/v1/query source=api time_taken_ms=1000 X-Dashboard-Uid=dashboard-1 X-Panel-Id=panel-1`,
 		},
+		"should include grafana user header": {
+			source: requestmeta.SourceAPI,
+			header: http.Header{
+				"X-Dashboard-Uid": []string{"dashboard-1"},
+				"X-Panel-Id":      []string{"panel-1"},
+				"X-Grafana-User":  []string{"admin"},
+			},
+			expectedLog: `level=info msg="slow query detected" method=GET host=localhost:8080 path=/prometheus/api/v1/query source=api time_taken_ms=1000 X-Dashboard-Uid=dashboard-1 X-Panel-Id=panel-1 X-Grafana-User=admin`,
+		},
 		"should include user agent, engine type and block store type headers": {
 			source: requestmeta.SourceAPI,
 			header: http.Header{