Daniel O'Mahony may refer to:
Daniel O'Mahony (born 1973), half-British half-Irish author, Daniel O'Mahony (Gaelic footballer) (born 2000), Irish Gaelic footballer Daniel O'Mahony (general) (died 1714), Irish army officer Danno O'Mahony (1912–1950), Irish professional wrestler Dan O'Mahony (born 1967), American musician, writer, and political activist