Malachy Ó Caollaidhe, also known as Malachy Queally, Malachias Quælly, O'Queely or O'Quechly (died 1645) was an Irish Roman Catholic archbishop of Tuam; he was called by Irish writers Maelseachlainn Ua Cadhla, by John Colgan Queleus, and erroneously by Thomas Carte, O'Kelly.