John Wall Callcott (20 November 1766 – 15 May 1821) was an eminent English composer. Callcott was born in Kensington, London. He was a pupil of Haydn, and is celebrated mainly for his glee compositions and catches. In the best known of his catches he ridiculed Sir John Hawkins' History of Music. Although ill-health prevented Callcott from completing his Musical Dictionary, His Musical Grammar (1806) remained in use throughout the 19th century. Callcott also composed solo songs and religious music including psalms and sacred canons.