Alfdred Hitchcock made many (37) cameo appearances in his films and even once in his TV show “Alfred Hitchcock Presents.” Of course, I am excluding his introductions. Sometimes he appeared twice in the same film. See “Rope” for example. Some of the appearances are pretty clever. One of my favorites is from “Lifeboat.”
Here is a website listing all of Hitchcock’s cameos.
The following link has a few Hitchcock Cameos