diff --git a/include/libcamera/request.h b/include/libcamera/request.h
index 4cf5ff3f7d3b..5596901ddd8e 100644
--- a/include/libcamera/request.h
+++ b/include/libcamera/request.h
@@ -65,6 +65,7 @@ private:
 	friend class PipelineHandler;
 
 	void complete();
+	void cancel();
 
 	bool completeBuffer(FrameBuffer *buffer);
 
diff --git a/src/libcamera/request.cpp b/src/libcamera/request.cpp
index ce2dd7b17f10..fc5e25199112 100644
--- a/src/libcamera/request.cpp
+++ b/src/libcamera/request.cpp
@@ -292,6 +292,36 @@ void Request::complete()
 	LIBCAMERA_TRACEPOINT(request_complete, this);
 }
 
+/**
+ * \brief Cancel a queued request
+ *
+ * Mark the request and its associated buffers as cancelled and complete it.
+ *
+ * Set the status of each buffer in the request to the frame cancelled state and
+ * remove them from the pending buffer queue before completing the request with
+ * error.
+ */
+void Request::cancel()
+{
+	LIBCAMERA_TRACEPOINT(request_cancel, this);
+
+	ASSERT(status_ == RequestPending);
+
+	/*
+	 * We can't simply loop and call completeBuffer() as erase() invalidates
+	 * pointers and iterators, so we have to manually cancel the buffer and
+	 * erase it from the pending buffers list.
+	 */
+	for (auto buffer = pending_.begin(); buffer != pending_.end();) {
+		(*buffer)->cancel();
+		(*buffer)->setRequest(nullptr);
+		buffer = pending_.erase(buffer);
+	}
+
+	cancelled_ = true;
+	complete();
+}
+
 /**
  * \brief Complete a buffer for the request
  * \param[in] buffer The buffer that has completed