Donal O'Neill may refer to:

Donal O'Neill or Domhnall Ó Néill, various kings of Tír Eóghain Donal O'Neill (Gaelic footballer) (born 1988), Gaelic footballer for Galway Donal O'Neill (swimmer), Irish swimmer

See also Dónal O'Neill (1967–2023), Irish Gaelic footballer