David Sydney Jackson (6 June 1889 – 28 February 1941) was an Australian politician. Born in Launceston, Tasmania, he was educated at state schools before becoming a manufacturing locksmith. He also served as President of the Tasmanian Chamber of Manufacturers. In 1919, he was elected to the Australian House of Representatives as the Nationalist member for Bass, defeating Nationalist-turned-independent MP Jens Jensen. He held the seat until his defeat in 1929 by Labor candidate Allan Guy. He became a businessman, and was chairman of the Tasmanian Exhibition in 1937. Jackson died in 1941.