David Dunbar may refer to:

• David Dunbar, of the Dunbar baronets
• David Dunbar (actor) (1886–1953), Australian film actor
• David Dunbar (colonel), 18th century surveyor of king's woods in North America, and Lt. Gov. of New Hampshire
• David Dunbar Buick (1854–1929), Scottish-born American inventor, best known for founding the Buick Motor Company
• David Dunbar-Nasmith (1921–1997), Royal Navy officer