John Mark Dempsey (born 7 April 1966) is an Australian politician who served as the Mayor of the Bundaberg Regional Council from 2016 to 2024.

[7] On 16 April 2012 Dempsey was appointed acting Minister for Police and Community Safety following the resignation of David Gibson.

[6] In January 2015, Dempsey was defeated in the 2015 Queensland state election by Labor candidate Leanne Donaldson.

[10] On 19 March 2016, Dempsey was elected as Mayor of Bundaberg Regional Council, winning with approximately 71% of the primary vote.

In March 2022 Dempsey announced he would be an independent candidate for the lower house seat of Hinkler at the 2022 federal election.