John de Lancie (born March 20, 1948 in Philadelphia, Pennsylvania) is a U.S. character actor best known for his role as recurring guest star "Q" on the various Star Trek series. De Lancie was a guest star on both the first and last episodes of Star Trek: The Next Generation.
Prior to his role on Star Trek, de Lancie played Eugene Bradford on the NBC soap opera Days of Our Lives from 1982 to 1986.
For a short time, he co-starred in Star Trek writer Michael Piller's creation Legend as eccentric scientist Janos Bartok. Following his days on Star Trek, De Lancie also had a recurring role as NID Colonel Frank Simmons on Stargate SG-1. He has also appeared in Andromeda (another creation of Gene Roddenberry) as Beka Valentine's Uncle Sid, as the angel Trias in the video game Planescape: Torment, as pollster Al Kiefer on The West Wing, and recently as an Elder on Charmed.
De Lancie and his wife, Marnie Mosiman, have a son, Keegan de Lancie, who appeared with his father as Q's son in Star Trek: Voyager's seventh season episode, "Q2". Another son, Owen de Lancie, appeared in "Star Trek World Tour (1998)".
De Lancie makes frequent appearances to the Pasadena Symphony, which holds orchestrated music in the Fall and the Spring. In Spring 2004, he gave pre-concert lectures where the symphony is held in Pasadena, California at the Pasadena Civic Auditorium.
John de Lancie's father, of the same name, was principal oboist of the Philadelphia Orchestra for many years. He died in 2001.
In 2006 De Lancie will make his opera directoral debute with The Atlanta Opera performing Puccini's "Tosca" on May 18 to May 21.
Along with Jonathan Frakes, Marina Sirtis, Armin Shimerman, Michael Ansara and Richard Poe, he is one of only six actors to play the same character on three different Star Trek series. He played Q in Star Trek: The Next Generation, Star Trek: Deep Space Nine and Star Trek: Voyager.
John de Lancie co-wrote the book I, Q with Peter David. He also co-wrote the novel Soldier of Light with Tom Cool.
Good friends with fellow "Star Trek" alumnus Kate Mulgrew.