John de Lancie is an American actor, best known for his role as Q in various Star Trek series (1987–present); beginning with Star Trek: The Next Generation and leading up to the third season of Star Trek: Picard in 2023.

De Lancie's first television role was in Captains and the Kings in 1976. His other television series roles include Eugene Bradford in Days of Our Lives (1982–1986; 1989–1990), Frank Simmons in Stargate SG-1 (2001–2002), Donald Margolis in Breaking Bad (2009–2010), Agent Allen Shapiro in Torchwood (2011), as well as the voice of Discord in My Little Pony: Friendship Is Magic (2011–2019).

De Lancie has become an outspoken secular activist and was a featured speaker at the 2016 Reason Rally and at CSICon 2019.