Flood is a traditional Irish and Scottish surname and may refer to:
- Alexandra Flood (born 1990), Australian operatic soprano, sister of Georgia Flood
- Ann Flood (1932–2022), American actress
- Anthony Flood (born 1984), Irish footballer
- Chris Flood (born 1947), Irish politician
- Colleen M. Flood, professor
- Curt Flood (1938–1997), American baseball player
- Daniel J. Flood (1903–1994), American politician
- Dennis Flood, American politician, mayor of Irvington, New York in 1994–2006
- Edward Flood (1805–1888), Australian politician
- Emmet Flood, American attorney
- Frank Flood (1901–1921), Irish war of independence soldier
- Georgia Flood, Australian actress, sister of Alexandra Flood
- Gerald Flood (1927–1989), British actor
- Henry Flood (1732–1791), Irish politician
- Hulda Flood (1886–1968), Swedish politician
- James Clair Flood, (1826–1889), American businessman
- Liam Flood (circa 1943 – 2014), Irish bookmaker and poker player
- Lisa Flood (born 1971), Canadian swimmer
- Mark Flood (disambiguation), several people
- Martin Flood (born 1964), Australian quiz–show winner
- Michael Flood (21st century), Australian sociologist
- Mike Flood (born 1975), American politician
- Philip Flood (born 1935), Australian diplomat
- Robert L. Flood (born 1955), British management scientist
- Sonny Flood (born 1989), British actor
- Toby Flood (born 1985), English rugby union player
- W. H. Grattan Flood (1857–1928), Irish musicologist, historian, and author
- Warden Flood (1694–1764), Irish judge and politician, MP for Callan 1727–1760, Lord Chief Justice 1760–1764
- Warden Flood (1735–1797), Irish politician, MP 1769–1797 for Longford Borough, Carysfort, Baltinglass, then Taghmon; nephew of the judge
- Willo Flood (born 1985), Irish footballer
- Sarah Flood-Beaubrun (born 1969), Saint Lucian lawyer and politician
- Mark Ellis (born 1960), British record producer known professionally as "Flood"
- Media related to Flood (surname) at Wikimedia Commons