He did not make a physical cameo appearance in Lifeboat(1944). Rather, his picture is in a newspaper that is being read by one of the characters.
He also did not appear in his first four films: Number 13(1922), Always Tell Your Wife (1923), The Pleasure Garden (1925) and Fear o' God aka The Mountain Eagle (1926). You could say that the first two don't really count, though, as Number 13 was never finished, and his directorial role in Always Tell Your Wife is uncredited.
His next film, The Lodger (1927), was the first one he appeared in, and he appeared in every movie he made from then on.
Additionally, all of the movies in the world that he never had anything to do with are films that do not contain a cameo appearance by Alfred Hitchcock.
Hitchcock made cameo appearances in 39 of his 52 major films. He appeared in every Hollywood film he made (30 total) from Rebecca onward.
The following films are the early films in which he did not make a cameo appearance:
Jamaica Inn (1939)
The Girl Was Young (1937)
Strauss' Great Waltz (1934)
Number 17 (1932)
East of Shanghai (1931)
Mary (1931)
The Skin Game (1931)
The Shame of Mary Boyle (1930)
The Manxman (1929)
Champagne (1928)
The Farmer's Wife (1928)
When Boys Leave Home (1927)
The Ring (1927)
Alfred Hitchcock
This is one of the few films directed by Hitchcock in which he does not make a cameo.
Psycho
Psycho
Alfred Hitchcock makes one of his typical cameo appearances early in the movie at the pet shop where he is seen walking a couple of terriers.
Alfred Hitchcock
This is one of the few films directed by Hitchcock in which he does not make a cameo.
Psycho
Psycho
We see Alfred Hitchcock make a cameo appearance as a pedestrian walking past the murder victim's house in the director's 1930 film Murder!
No, he did not.
Alfred Hitchcock makes one of his typical cameo appearances early in the movie at the pet shop where he is seen walking a couple of terriers.
Alfred Hitchcock
No, Hitchcock did not make a cameo appearance in, nor did he direct, Witness for the Prosecution. The movie was directed by Billy Wilder. You may be thinking of The Paradine Case, a different courtroom drama that was directed by Alfred Hitchcock.
He is the man who misses the bus
Lifeboat (1944) was Hitchcock's cameo appearance.
A "cameo" is a piece of jewelry in the form of a carved silhouette. In the theater, the phrase "cameo appearance" was used to refer to a brief appearance in a play or movie, frequently where the actor is not playing any role. For example, Alfred Hitchcock appeared "in cameo" in most of his movies; frequently walking by as an anonymous face in the crowd, or boarding a bus in the background of the scene.