Isaac Sidney Caesar (born September 8, 1922) is an Emmy-winning American comic actor and writer best known as the leading man on the 1950s television series Your Show of Shows and Caesar's Hour, and to younger generations as Coach Calhoun in Grease and Grease 2.

Following the cancellation of his earlier series "Sid Caesar Invites You" (1958), Sid Caesar was invited by the BBC to mount a new version of the show for British TV. This series was also short-lived, making this one of the first and perhaps only cases of two series with the same title and the same star in two different countries completing their run within the same calendar year.

Immediately after the series was cancelled, Sid Caesar was hired to star in a British version with the same title.

Comedian, saxophonist, composer, actor and musician, he performed within the orchestras of Charlie Spivak, Shep Fields (I) and Claude Thornhill as saxophonist. Later, as super-hip jazz musician "Cool Cees" in television skits, he played tenor saxophone, and sang with the satirical trio "The Hair Cuts" (with Carl Reiner and Howard Morris (I)). He sang the lead role in "Little Me" on Broadway. Joining ASCAP in 1955, his popular song compositions include "I Wrote This Song for Your Birthday" and "Was That You?".