Harold "Hal" Block (August 2, 1913 – June 16, 1981) was an American comedy writer, comedian, producer, songwriter and television personality. Block is most often remembered as an original panelist of the television game show “What's My Line?” who was fired from the show in only its third season, reportedly for inappropriate on-air behavior. Block is a controversial figure in the history of television with denunciations being made by some, while others praise him as a comedy writer and credit him with contributing to the original success of What's My Line?
During the 1940s, Block was considered one of America's best comedy writers, having worked for many of the top comedians of the era, such as Bob Hope, Abbott and Costello, Martin and Lewis, Milton Berle and Burns and Allen and in all major mediums, including radio, Hollywood movies, Broadway and print. Block also made a major contribution to the USO during World War II.