Dahm is a surname. Notable people with the surname include:
Britta Dahm (born 1968), German breaststroke swimmer
Daniel Dahm (born 1969), German geographer and ecologist
Fredrik Dahm (born 1982), Norwegian footballer
Helen Dahm (1878–1968), Swiss artist
Jan Dahm (1921–2013), Norwegian resistance member during World War II
Mads Dahm (born 1988), Norwegian footballer
Nathan Dahm (born c. 1983), American politician from Oklahoma
Paul Dahm (born 1951), Luxembourgish composer
Rich Dahm, American television writer
Sebastian Dahm (born 1987), Danish professional ice hockey player
Tobias Dahm (born 1987), German athlete specialising in the shot put
Werner Dahm (1917–2008), German spaceflight scientist
Nicole, Erica and Jaclyn Dahm (born 1977), American triplet models
