Cadogan () is a surname of Welsh or Irish origin and is a variant of the Welsh name Cadwgan (), as well as an anglicisation of the Irish surname Ó Ceadagáin. Notable people with the surname include:
Alan Cadogan (born 1993), Irish hurling player Alexander Cadogan (1884–1968), British civil servant and Chairman of Board of Governors of the BBC Charles Cadogan (disambiguation), multiple people Edward Cadogan (disambiguation), multiple people Eoin Cadogan (born 1986), Irish Gaelic football and hurling player Frederick William Cadogan (1821–1904), British barrister and politician George Cadogan (disambiguation), multiple people Gerald Cadogan (born 1986), American footballer Gerald Cadogan, 6th Earl Cadogan (1869–1933), British soldier Henry Cadogan (disambiguation), multiple people John Cadogan (1930–2020), British organic chemistry professor Kevin Cadogan (born 1970), American guitarist and founding member of Third Eye Blind Kieron Cadogan (born 1990), English footballer León Cadogan (1899–1973), Paraguayan ethnologist Mary Cadogan (1928–2014), English writer on children's fiction Nancy Cadogan (born 1979), British figurative painter Peter Cadogan (1921–2007), English writer and political activist Sean Cadogan, Australian physicist, working in Canada Susan Cadogan (born 1951), Jamaican reggae singer William Cadogan (disambiguation), multiple people