Malachy is a given name.
Notable bearers of the name include:
St. Malachy (1095-1148), Archbishop of Armagh and first native-born Irish saint
Máel Sechnaill mac Máele Ruanaid, 9th-century High King of Ireland, also known as Malachy I
Máel Sechnaill mac Domnaill, High King of Ireland in the late 10th and early 11th centuries, also known as Malachy II
Malachy McCourt (born 1931), Irish-American actor, writer and politician
Malachy Fisher, fictional character from the British soap opera Hollyoaks
Palacegarden Malachy, winner of the 2012 Westminster Kennel Club Dog Show