David Letterman is an American television host, comedian, writer, and producer.

Letterman hosted late night television talk shows for 33 years, beginning with the February 1, 1982, debut of Late Night with David Letterman on NBC, and ending with the May 20, 2015, broadcast of Late Show with David Letterman on CBS. In total, Letterman hosted 6,080 episodes of Late Night and Late Show, surpassing his friend and mentor Johnny Carson as the longest-serving late night talk show host in American television history.

In 1996, Letterman was ranked 45th on TV Guide's 50 Greatest TV Stars of All Time. In 2002, Late Show with David Letterman was ranked seventh on TV Guide's 50 Greatest TV Shows of All Time.

Letterman is also a television and film producer. His company, Worldwide Pants, produced his shows as well as The Late Late Show and several prime-time comedies, the most successful of which was Everybody Loves Raymond, now in syndication.

Several late-night hosts have cited Letterman's influence, including Conan O'Brien (his successor on Late Night), Stephen Colbert (his successor on Late Show), Jimmy Fallon, Jimmy Kimmel, John Oliver, and Seth Meyers.