Hyam Greenbaum (12 May 1901 – 13 May 1942) was an English conductor, violinist and composer who in 1936 became the world's first conductor of a television orchestra. He was friendly with many of his English music contemporaries, including Constant Lambert, Alan Rawsthorne, and William Walton and often helped them with technical advice on orchestration. His sister was the pianist and composer Kyla Greenbaum (1922-2017).