diff --git a/src/components/admin/review-row.tsx b/src/components/admin/review-row.tsx
index 0da9f62..155e131 100644
--- a/src/components/admin/review-row.tsx
+++ b/src/components/admin/review-row.tsx
@@ -644,6 +644,10 @@ export function ReviewRow({
   // time (decided_at is unset until approve/dismiss).
   const rowTimestamp = review.decided_at ?? review.created_at
   const relativeTime = formatDateRelative(rowTimestamp, rowTimestamp ?? "")
+  // Who made the decision ("admin" from the UI, "stakwork" from workflows).
+  // Trim guards legacy reviews decided before decided_by was reliable ("").
+  const decider =
+    review.status !== "pending" ? review.decided_by?.trim() : undefined
 
   const direction = useMemo(
     () => extractDirection(review.action_name, review.action_payload),
@@ -851,6 +855,12 @@ export function ReviewRow({
           {review.run_ref_id && <span>Run #{review.run_ref_id.slice(-5)}</span>}
           {review.run_ref_id && <span>·</span>}
           <span>{relativeTime}</span>
+          {decider && (
+            <>
+              <span>·</span>
+              <span data-testid="review-decider">by {decider}</span>
+            </>
+          )}
         </div>
 
         <div className="flex shrink-0 justify-end" onClick={(e) => e.stopPropagation()}>
diff --git a/src/lib/__tests__/reviews.test.tsx b/src/lib/__tests__/reviews.test.tsx
index 730534d..e936dd6 100644
--- a/src/lib/__tests__/reviews.test.tsx
+++ b/src/lib/__tests__/reviews.test.tsx
@@ -139,6 +139,41 @@ describe("ReviewRow", () => {
     expect(badge!.className).toContain("bg-red-500")
   })
 
+  // ── Decider attribution ─────────────────────────────────────────────────────
+
+  it("shows who decided on decided reviews", () => {
+    const { container } = render(
+      <ReviewRow
+        schemas={[]}
+        review={makeReview({ status: "dismissed", decided_by: "stakwork" })}
+        onRefresh={noop}
+      />
+    )
+    const decider = container.querySelector("[data-testid='review-decider']")
+    expect(decider).toBeTruthy()
+    expect(decider!.textContent).toBe("by stakwork")
+  })
+
+  it("hides decider on pending reviews and on legacy blank decided_by", () => {
+    const pending = render(
+      <ReviewRow
+        schemas={[]}
+        review={makeReview({ status: "pending", decided_by: "admin" })}
+        onRefresh={noop}
+      />
+    )
+    expect(pending.container.querySelector("[data-testid='review-decider']")).toBeNull()
+
+    const legacy = render(
+      <ReviewRow
+        schemas={[]}
+        review={makeReview({ status: "dismissed", decided_by: "" })}
+        onRefresh={noop}
+      />
+    )
+    expect(legacy.container.querySelector("[data-testid='review-decider']")).toBeNull()
+  })
+
   // ── Approve / Dismiss only for pending ─────────────────────────────────────
 
   it("shows Approve and Dismiss buttons only for pending rows", () => {
diff --git a/src/lib/graph-api.ts b/src/lib/graph-api.ts
index 3e3154f..a0f2a46 100644
--- a/src/lib/graph-api.ts
+++ b/src/lib/graph-api.ts
@@ -1178,7 +1178,12 @@ export async function approveReview(
   // cancel_active_runs: an admin deciding here makes any in-flight
   // human-review workflow moot, so ask the backend to stop it. Workflows
   // deciding their own reviews omit this — cancelling would kill their run.
-  const body: Record<string, unknown> = { cancel_active_runs: true }
+  // decided_by distinguishes admin-UI decisions from workflow ones on the
+  // review node (workflows send their own identity, e.g. "stakwork").
+  const body: Record<string, unknown> = {
+    cancel_active_runs: true,
+    decided_by: "admin",
+  }
   if (overridePayload) body.override_payload = overridePayload
   return api.post<ReviewDecisionResponse>(
     `/v2/reviews/${refId}/approve`,
@@ -1204,10 +1209,11 @@ export async function dismissReview(
     }
     return { status: "Success", review }
   }
-  // cancel_active_runs: same admin-decided semantics as approveReview above.
+  // cancel_active_runs + decided_by: same admin-decided semantics as
+  // approveReview above.
   return api.post<ReviewDecisionResponse>(
     `/v2/reviews/${refId}/dismiss`,
-    { reason, cancel_active_runs: true },
+    { reason, cancel_active_runs: true, decided_by: "admin" },
     undefined,
     signal
   )