McElroy is the surname of a number of people:
Alan B. McElroy, American writerCaralee McElroy, musicianEdward J. McElroy, labor leaderGeorge Edward Henry McElroy (1893–1918), Irish World War I Flying AceGreg McElroy, American professional football player for the New York JetsJames McElroy (1945–2011), Irish American mobsterJohn McElroy, SJ (1782-1877), one of two of the Army's first Catholic Chaplains. Founder of St. John's Literary Institute, Boston College High School, and Boston College.John McElroy (1846–1929), American soldier, journalist and authorJoseph McElroy, (b.1930) American novelistKen McElroy (1934–1981), American murder victimMark McElroy (1906-1981), American politicianMark D. McElroy, American politicianMary Arthur McElroy (1841–1917), sister of a President of the United StatesMichael McElroy, musical theatre actorMichael McElroy (scientist), atmosphere scientistNeil H. McElroy (1904–1972), American Secretary of DefenseRobert McNutt McElroy (1872–1959), professor at Princeton UniversityRoy McElroy (1907–1994), Mayor of Auckland, New Zealand (1965–1968)Wendy McElroy, Canadian authorWilliam D. McElroy (1917–1999), American biochemistWilliam S. McElroy, American tennis player