John de Lancie is an American actor, director, producer, writer, and comedian, best known for his role as Q in various Star Trek series (1987–present); beginning with Star Trek: The Next Generation and leading right up to the second season of Star Trek: Picard in 2022.

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).