David or Dai Rees may refer to:

• David Rees (author) (1936–1993), British children's author
• Dave Rees (born 1969), American drummer for SNFU and Wheat Chiefs
• David Rees (cartoonist) (born 1972), American cartoonist and television host

• Dai Rees (rugby, born c. 1885), Welsh rugby league footballer who played in the 1900s
• Dai Rees (rugby, 1920s), Welsh rugby union and rugby league footballer who played in the 1920s and 1930s, and coached rugby league in the 1930s to the 1960s
• Dai Rees (1913–1983), Welsh golfer
• David Rees (British cross-country skier) (born 1940), British cross-country skier
• David Rees (Canadian cross-country skier) (born 1943), Canadian cross-country skier
• Dai Rees (rugby union, born 1964), Welsh rugby union footballer who played in the 2000s, and coached in the 2000s and 2010s
• David Rees (rugby union, born 1974), English rugby union footballer who played in the 1990s and 2000s

• David Rees (Y Cynhyrfwr) (1801–1869), Welsh Nonconformist minister and editor
• David Rees (mathematician) (1918–2013), British mathematician
• Sir Dai Rees (biochemist) (1936–2021), British biochemist and science administrator
• D. Ben Rees (David Benjamin Rees, born 1937), Welsh-language publisher and leader of the Welsh community in Liverpool
• David Rees (politician) (born 1957), member of the National Assembly for Wales
• David Rees (organic chemist) (born 1958), British organic chemist and chief scientific officer at Astex

• David Rees-Williams, 1st Baron Ogmore (1903–1976), British politician
• Rees for people with this surname
• David Reese (disambiguation)
• David Reece, American singer