Curtis Sliwa (1954) is an American activist, radio talk show host and founder and chief executive officer of the Guardian Angels, a nonprofit organization for unarmed crime prevention.

Sliwa was the Republican nominee for the 2021 New York City mayoral election, which he lost to Brooklyn Borough President Eric Adams.

In May 1977, Sliwa created the "Magnificent 13", a group dedicated to combating violence and crime on the New York City Subway, when NYC was experiencing a crime wave. The Magnificent 13 grew and was renamed the Guardian Angels in 1979.

In December 2019, Sliwa declared in an interview that he hated then Republican President of the United States Donald Trump, calling him a "screwball and a crackpot".