McStay is a surname. Notable people with the surname include:
Chris McStay (born 1996), Scottish footballer
Daniel McStay (born 1995), Australian rules footballer
Francis McStay (1892–1934), Scottish footballer with Motherwell
Gerard McStay (1928–2001), Gaelic footballer
Henry McStay (born 1985), football player from Lurgan in Northern Ireland
Janetta McStay CBE (1917–2012), New Zealand concert pianist and music professor
Jimmy McStay (1893–1974), former Scottish footballer and manager
Jimmy McStay (footballer, born 1922) (1922–2007), professional footballer
John McStay ("Jock") (born 1965), Scottish former professional footballer
Kevin McStay (born 1962), Irish Gaelic football manager, commentator, analyst and former player Michael McStay (born 1933), of No Hiding Place Paul McStay MBE (born 1964), former football player who spent his entire career with Scottish team Celtic Football Club Ray McStay (born 1970), Scottish former footballer Ryan McStay (born 1985), in Bellshill, is a professional footballer Willie McStay (footballer, born 1892) (1892–1960), Scottish international footballer Willie McStay (footballer, born 1961), former professional footballer McStay family murder, a case about an American family who went missing in 2010 and whose bodies were discovered in 2013