Jack Dempsey (1878 – 10 December 1913) was an Irish Gaelic footballer.
His championship career at senior level with the Dublin county team lasted six seasons from 1902 until 1907.
He won his sole county senior championship medal in 1901.
Dempsey made his debut on the inter-county scene as a member of the Dublin senior football team during the 1902 championship.
Over the course of the next six seasons, he won three All-Ireland medals, beginning with a lone victory as captain of the team in 1902, followed by back-to-back championships in 1906 and 1907.