McCrystal is a surname. Notable people with the surname include:

Cal McCrystal (journalist), British journalist Eamonn McCrystal (tenor), Northern Irish Singer Cal McCrystal (director), British theatre director, son of the above Damien McCrystal, British journalist, son of the journalist Cal McCrystal Eve McCrystal, Irish cyclist Kevin McCrystal, Gaelic football manager

See also McChrystal