Niall Callum James Peter Maher (born 31 July 1995) is an English professional footballer who plays as a defender for EFL League Two side Grimsby Town. He has previously played in the Football League for Bolton Wanderers, Blackpool and Bury, as well as in the League of Ireland with Galway United and in non-league football with AFC Telford United and FC Halifax Town. He was voted as part of the National League team of the season for 2021–22.