Jack Sydney Bates Gentry CBE, CIE (4 October 1899 – 16 April 1978) was an English first-class cricketer. Gentry was a right-handed batsman who bowled slow left-arm orthodox spin. Gentry was educated at Christ's Hospital, where he represented the school cricket team. Gentry made his first-class debut for Hampshire, playing a single match for the county against Essex in 1919. In 1925 Gentry played a single first-class match for Essex against Yorkshire at Leyton Cricket Ground. Gentry died at Loxwood, Sussex on 16 April 1978 following a long illness.