John Cullum (born March 2, 1930) is an American actor and singer. A five-time nominee and two-time Tony Award winner, both times for Best Actor in a Musical (Shenandoah in 1975 and On the Twentieth Century in 1978). On screen, Cullum is best known for the lead role of tavern owner Holling Vincoeur on the series Northern Exposure (1990–1995), which earned him an Emmy nomination.

He also had recurring roles on the series ER, Law & Order: Special Victims Unit, The Middle, and Madam Secretary. His film work includes Hawaii (1966), 1776 (1972), All Good Things (2010), Kill Your Darlings (2013), Before We Go (2014), and Christine (2016).