David or Dave Barr may refer to:

• David G. Barr (1895–1970), U.S. Army Major General
• David Barr (politician) (born 1946), Australian politician
• David Barr (Canadian Forces officer) (born 1959), Canadian military officer
• Dave Barr (American football) (born 1972), American football quarterback
• Dave Barr (golfer) (born 1952), Canadian golfer
• Dave Barr (ice hockey) (born 1960), Canadian ice hockey player
• Dave Barr (motorcyclist) (born 1952), American veteran and motorcyclist who circumnavigated the globe despite having both legs amputated
• David Barr (English cricketer) (born 1970), English cricketer
• David Barr (Irish cricketer) (born 1993), Irish cricketer
• David Barr (playwright), American writer and playwright
• David William Keith Barr, British administrator in India

• David Barr Kirtley (born 1977), American short-story writer
• David Barr Chilton (born 1961), Canadian author