diff --git a/dev-packages/deno-integration-tests/suites/orchestrion-lru-memoizer/test.ts b/dev-packages/deno-integration-tests/suites/orchestrion-lru-memoizer/test.ts
new file mode 100644
index 000000000000..4cbdc3179943
--- /dev/null
+++ b/dev-packages/deno-integration-tests/suites/orchestrion-lru-memoizer/test.ts
@@ -0,0 +1,124 @@
+// <reference lib="deno.ns" />
+
+import { tracingChannel } from 'node:diagnostics_channel';
+import type { Span, TransactionEvent } from '@sentry/core';
+import type { DenoClient } from '@sentry/deno';
+import {
+  getActiveSpan,
+  getCurrentScope,
+  getGlobalScope,
+  getIsolationScope,
+  init,
+  startSpan,
+  startSpanManual,
+} from '@sentry/deno';
+import { assert } from 'https://deno.land/std@0.212.0/assert/assert.ts';
+import { assertEquals } from 'https://deno.land/std@0.212.0/assert/assert_equals.ts';
+import { assertExists } from 'https://deno.land/std@0.212.0/assert/assert_exists.ts';
+
+function resetGlobals(): void {
+  getCurrentScope().clear();
+  getCurrentScope().setClient(undefined);
+  getIsolationScope().clear();
+  getGlobalScope().clear();
+}
+
+/** See deno-redis.test.ts — same sink shape, deduped for clarity. */
+function transactionSink(): {
+  beforeSendTransaction: (event: TransactionEvent) => null;
+  waitFor: (predicate: (event: TransactionEvent) => boolean) => Promise<TransactionEvent>;
+} {
+  const transactions: TransactionEvent[] = [];
+  const waiters: { predicate: (e: TransactionEvent) => boolean; resolve: (e: TransactionEvent) => void }[] = [];
+  return {
+    beforeSendTransaction(event) {
+      transactions.push(event);
+      for (let i = waiters.length - 1; i >= 0; i--) {
+        const w = waiters[i]!;
+        if (w.predicate(event)) {
+          waiters.splice(i, 1);
+          w.resolve(event);
+        }
+      }
+      return null;
+    },
+    waitFor(predicate) {
+      const already = transactions.find(predicate);
+      if (already) return Promise.resolve(already);
+      return new Promise<TransactionEvent>(resolve => {
+        waiters.push({ predicate, resolve });
+      });
+    },
+  };
+}
+
+function withTimeout<T>(p: Promise<T>, ms: number, what: string): Promise<T> {
+  let timer: ReturnType<typeof setTimeout> | undefined;
+  const timeout = new Promise<T>((_, reject) => {
+    timer = setTimeout(() => reject(new Error(`Timed out waiting for ${what} after ${ms}ms`)), ms);
+  });
+  return Promise.race([p, timeout]).finally(() => {
+    if (timer !== undefined) clearTimeout(timer);
+  });
+}
+
+Deno.test('lru-memoizer instrumentation: included in default integrations (Deno 2.8.0+)', () => {
+  resetGlobals();
+  const client = init({ dsn: 'https://username@domain/123' }) as DenoClient;
+  const names = client.getOptions().integrations.map(i => i.name);
+  assert(names.includes('LruMemoizer'), `LruMemoizer should be in defaults, got ${names.join(', ')}`);
+});
+
+// lru-memoizer creates no span of its own; it restores the caller's scope onto
+// the memoized callback (which it fires from a detached `setImmediate`). We drive
+// `start` while a parent span is active (capturing the caller's context), then
+// drive `asyncStart` from a detached context where that span is NOT active — as
+// happens when the callback fires later. Without the restore, work there starts a
+// new trace; with it, the parent is active again and a span nests under it.
+Deno.test('lru-memoizer instrumentation: restores the caller scope onto the memoized callback', async () => {
+  resetGlobals();
+  const sink = transactionSink();
+  init({
+    dsn: 'https://username@domain/123',
+    tracesSampleRate: 1,
+    beforeSendTransaction: sink.beforeSendTransaction,
+  });
+
+  const channel = tracingChannel('orchestrion:lru-memoizer:load');
+  const ctx = { arguments: [] };
+
+  let parentSpan: Span | undefined;
+  // `startSpanManual` leaves the span open after the callback but deactivates it,
+  // so the `asyncStart` below runs with no active span — a genuine detached context.
+  startSpanManual({ name: 'parent', op: 'test', forceTransaction: true }, span => {
+    parentSpan = span;
+    channel.start.runStores(ctx, () => undefined);
+  });
+
+  // Detached: no active span here.
+  assertEquals(getActiveSpan(), undefined);
+
+  let restoredActive: Span | undefined;
+  channel.asyncStart.runStores(ctx, () => {
+    restoredActive = getActiveSpan();
+    startSpan({ name: 'memoized-work', op: 'test' }, () => undefined);
+  });
+  channel.asyncEnd.publish(ctx);
+  parentSpan!.end();
+
+  // The callback saw the caller's span restored.
+  assertEquals(restoredActive, parentSpan);
+
+  const parent = await withTimeout(
+    sink.waitFor(t => t.transaction === 'parent'),
+    5000,
+    "'parent' transaction",
+  );
+
+  // The span created in the restored callback nested under the caller, not a new trace.
+  const child = parent.spans?.find(s => s.description === 'memoized-work');
+  assertExists(
+    child,
+    `expected memoized-work nested under parent, got: ${parent.spans?.map(s => s.description).join(', ')}`,
+  );
+});
diff --git a/packages/deno/src/index.ts b/packages/deno/src/index.ts
index 95310d319a1e..404bdbabb833 100644
--- a/packages/deno/src/index.ts
+++ b/packages/deno/src/index.ts
@@ -121,6 +121,7 @@ export {
   genericPoolChannelIntegration,
   knexChannelIntegration,
   koaChannelIntegration,
+  lruMemoizerChannelIntegration,
   mongodbChannelIntegration,
   mongooseChannelIntegration,
   mysqlChannelIntegration,
diff --git a/packages/deno/src/sdk.ts b/packages/deno/src/sdk.ts
index 5c0c237207f1..78c85bd29a2c 100644
--- a/packages/deno/src/sdk.ts
+++ b/packages/deno/src/sdk.ts
@@ -15,6 +15,7 @@ import {
   amqplibChannelIntegration,
   genericPoolChannelIntegration,
   koaChannelIntegration,
+  lruMemoizerChannelIntegration,
   mongodbChannelIntegration,
   mongooseChannelIntegration,
   mysqlChannelIntegration,
@@ -78,6 +79,7 @@ export function getDefaultIntegrations(_options: Options): Integration[] {
           amqplibChannelIntegration(),
           genericPoolChannelIntegration(),
           koaChannelIntegration(),
+          lruMemoizerChannelIntegration(),
           mongodbChannelIntegration(),
           mongooseChannelIntegration(),
           mysqlChannelIntegration(),
diff --git a/packages/deno/test/__snapshots__/mod.test.ts.snap b/packages/deno/test/__snapshots__/mod.test.ts.snap
index 2c8a22a7782d..a0aa2ff47068 100644
--- a/packages/deno/test/__snapshots__/mod.test.ts.snap
+++ b/packages/deno/test/__snapshots__/mod.test.ts.snap
@@ -118,6 +118,7 @@ snapshot[`captureException 1`] = `
       "Amqplib",
       "GenericPool",
       "Koa",
+      "LruMemoizer",
       "Mongo",
       "Mongoose",
       "Mysql",
@@ -203,6 +204,7 @@ snapshot[`captureMessage 1`] = `
       "Amqplib",
       "GenericPool",
       "Koa",
+      "LruMemoizer",
       "Mongo",
       "Mongoose",
       "Mysql",
@@ -295,6 +297,7 @@ snapshot[`captureMessage twice 1`] = `
       "Amqplib",
       "GenericPool",
       "Koa",
+      "LruMemoizer",
       "Mongo",
       "Mongoose",
       "Mysql",
@@ -394,6 +397,7 @@ snapshot[`captureMessage twice 2`] = `
       "Amqplib",
       "GenericPool",
       "Koa",
+      "LruMemoizer",
       "Mongo",
       "Mongoose",
       "Mysql",