Cahen is a surname and/or a first name that may refer to:
Cahen's constant, an infinite series of unit fractions, with alternating signs, derived from Sylvester's sequence Cahen–Mellin integral, an integral transform
People Albert Cahen (1846–1903), French composer Claude Cahen (1909–1991), French orientalist and Islamic historian Coralie Cahen (1832–1899), philanthropist Ernest Cahen (1828–1893), French composer and organist Enrique Cahen Salaberry (1911–1991), Argentine film director Louis Cahen d'Anvers (1837–1922), French banker Mónica Cahen D'Anvers (born 1934), Argentine journalist, TV news host, and actress Fritz Max Cahén (1891–1966), German journalist, writer, and spy
See also Cohen (surname), Kohen, Cohan, Cahan