diff --git a/packages/opentelemetry/src/spanExporter.ts b/packages/opentelemetry/src/spanExporter.ts
index 6430f0f23da5..3328b64c8230 100644
--- a/packages/opentelemetry/src/spanExporter.ts
+++ b/packages/opentelemetry/src/spanExporter.ts
@@ -191,6 +191,14 @@ export class SentrySpanExporter {
       sentSpans.add(span);
       const transactionEvent = createTransactionForOtelSpan(span);
 
+      // Add an attribute to the transaction event to indicate that this transaction is an orphaned transaction
+      if (root.parentNode && this._sentSpans.has(root.parentNode.id)) {
+        const traceData = transactionEvent.contexts?.trace?.data;
+        if (traceData) {
+          traceData['sentry.parent_span_already_sent'] = true;
+        }
+      }
+
       // We'll recursively add all the child spans to this array
       const spans = transactionEvent.spans || [];
 
diff --git a/packages/opentelemetry/test/integration/transactions.test.ts b/packages/opentelemetry/test/integration/transactions.test.ts
index 9bc1847b422b..c3cc9b0e8b7b 100644
--- a/packages/opentelemetry/test/integration/transactions.test.ts
+++ b/packages/opentelemetry/test/integration/transactions.test.ts
@@ -612,6 +612,20 @@ describe('Integration | Transactions', () => {
     expect(transactions).toHaveLength(2);
     expect(transactions[0]?.spans).toHaveLength(1);
 
+    expect(transactions[0]?.transaction).toBe('test name');
+    expect(transactions[0]?.contexts?.trace?.data).toEqual({
+      'sentry.origin': 'manual',
+      'sentry.sample_rate': 1,
+      'sentry.source': 'custom',
+    });
+
+    expect(transactions[1]?.transaction).toBe('inner span 2');
+    expect(transactions[1]?.contexts?.trace?.data).toEqual({
+      'sentry.parent_span_already_sent': true,
+      'sentry.origin': 'manual',
+      'sentry.source': 'custom',
+    });
+
     const finishedSpans: any = exporter['_finishedSpanBuckets'].flatMap(bucket =>
       bucket ? Array.from(bucket.spans) : [],
     );