David Philip Benedict Smith (born 25 March 1970) is an Australian politician. On 23 May 2018, the High Court of Australia declared him elected as a Senator for the Australian Capital Territory after Labor senator Katy Gallagher was found ineligible to have been elected. Before his election, Smith was the ACT director of the Professionals Australia union. He was sworn in to the Australian Senate on 18 June 2018. He was elected to the lower-house seat of Bean at the 2019 federal election.