Garreau is a French surname. Notable people with the surname include:
- Georges Garreau (1902–1986), French diver at the 1924 Olympics
- Joel Garreau (born 1948), American journalist and writer
- Lazare Garreau (1812 – 1892), French plant physiologist
- Ludovic Garreau (born 1983), French ice hockey coach and former player
See also
- Éliane Jeannin-Garreau (1911–1999), French Resistance member
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