Robert Hudson Walker (October 13, 1918 - August 28, 1951) was an American actor who starred as the villain in Alfred Hitchcock's thriller Strangers on a Train (1951), which was released shortly before his premature death.

He started in youthful boy-next-door roles, often as a World War II soldier. One of these roles was opposite his first wife, Jennifer Jones, in the World War II epic Since You Went Away