Dahm is a surname. Notable people with the surname include:
Britta Dahm (born 1968), German breaststroke swimmerDaniel Dahm (born 1969), German geographer and ecologistFredrik Dahm (born 1982), Norwegian footballerHelen Dahm (1878–1968), Swiss artistJan Dahm (1921–2013), Norwegian resistance member during World War IIMads Dahm (born 1988), Norwegian footballerNathan Dahm (born c. 1983), American politician from OklahomaPaul Dahm (born 1951), Luxembourgish composerRich Dahm, American television writerSebastian Dahm (born 1987), Danish professional ice hockey playerTobias Dahm (born 1987), German athlete specialising in the shot putWerner Dahm (1917–2008), German spaceflight scientistNicole, Erica and Jaclyn Dahm (born 1977), American triplet models