John Walter Knapp (8 March 1841 – 22 June 1881) was an English cricketer. Knapp's batting style is unknown; he bowled right-arm fast. The son of Tyrell Knapp and Harriett Harris, he was born in Paddington, London. In 1859 he attended Exeter College, Oxford. Knapp married a Kate M. Taylor at Woodmansterne, Surrey on 30 July 1878. He died at St Leonards-on-Sea, Sussex on 22 June 1881, aged 40.