William James Remar (born December 31, 1953) is an American actor. He has played numerous roles over a 40 year career, most notably Ajax in The Warriors (1979), Albert Ganz in 48 Hrs. (1982), Dutch Schultz in The Cotton Club (1984), Jack Duff in Miracle on 34th Street (1994), Richard Wright in Sex and the City (2001–2004), and Harry Morgan, the father of the title character, in Dexter (2006–2013). Since 2009 he has done voice-over work in ads for Lexus luxury cars. Remar studied acting at the Neighborhood Playhouse School of the Theatre in New York City.

Remar's more recent roles include Frank Gordon in Gotham from 2016 to 2019; Peter Gambi in Black Lightning from 2018 to 2021; and Secretary of War Henry L. Stimson in Oppenheimer (film) in 2023.