Cogan is a surname of Gaelic origin (not to be confused with the surname Kogan of Russian-Jewish origin). Notable people with the surname include:
Alma Cogan (1932–1966), English singerAndrew Cogan, 17th-century agent of the English East India CompanyBarry Cogan (footballer) (born 1984)Barry Cogan (politician) (born 1936)Brian Cogan (born 1954)David G. Cogan (1908–1993), American ophthalmologistDean Cogan (1826–1872), Irish priest and writerFanny Cogan (1866–1929), American actressFrank Cogan (born 1944), Irish Gaelic footballerHenri Cogan (1924–2003), French actor and stuntmanKevin Cogan (born 1956), American Formula 1 driverMaggie Cogan (born 1943), American horse and carriage driverPatrick Cogan (1903–1977), Irish politicianPhilip Cogan (1750–1833), Irish composerPierre Cogan (1914–2013), French cyclistRobert Cogan (born 1930), American composer and music theoristSara Cogan, English actressThomas Cogan (1736–1818), English physician and writerTony Cogan (born 1976), American baseball playerWilliam Cogan (1823–1894), Irish politician