McElroy is the surname of a number of people:
Alan B. McElroy, American writer
Caralee McElroy, musician
Edward J. McElroy, labor leader
George Edward Henry McElroy (1893–1918), Irish World War I Flying Ace
Greg McElroy, American professional football player for the New York Jets
James McElroy (1945–2011), Irish American mobster
John 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 author
Joseph McElroy, (b.1930) American novelist
Ken McElroy (1934–1981), American murder victim
Mark McElroy (1906-1981), American politician
Mark D. McElroy, American politician
Mary Arthur McElroy (1841–1917), sister of a President of the United States
Michael McElroy, musical theatre actor
Michael McElroy (scientist), atmosphere scientist
Neil H. McElroy (1904–1972), American Secretary of Defense
Robert McNutt McElroy (1872–1959), professor at Princeton University
Roy McElroy (1907–1994), Mayor of Auckland, New Zealand (1965–1968)
Wendy McElroy, Canadian author
William D. McElroy (1917–1999), American biochemist
William S. McElroy, American tennis player
