Gilbert Alexander Ralston (January 5, 1912 – March 18, 1999) was a British-American screenwriter, journalist and author. He was a television producer in the 1950s and a screenwriter in the 1960s. He created the television series The Wild Wild West and wrote scripts for Star Trek, Gunsmoke, Ben Casey, I Spy, Hawaii Five-O and Naked City. He wrote the screenplay for the 1971 movie Willard, which was based on the 1968 novel Ratman's Notebooks written by Stephen Gilbert.