Sue Ellen Ewing is a fictional character and one of the female leads in the CBS primetime soap opera Dallas. Sue Ellen was portrayed by Linda Gray and appeared on the show since its pilot episode, first broadcast on April 2, 1978. Dallas followed the trials of the wealthy Ewing family in the city of Dallas, Texas, into which Sue Ellen married when she wed J.R. Ewing. Gray played Sue Ellen until the twelfth season of Dallas, when her character finally leaves Texas after beating J.R. at his own game in the 1989 episode "Reel Life". Gray returned for the 1991 series finale "Conundrum" and the subsequent Dallas telemovies. She reprised the role for the 2012 continuation series of Dallas, which ran until 2014.

Dallas is an American prime time television soap opera that aired on CBS from April 2, 1978, to May 3, 1991. The series revolved around an affluent and feuding Texas family, the Ewings, who owned the independent oil company Ewing Oil and the cattle-ranching land of Southfork. The series originally focused on the marriage of Bobby Ewing and Pamela Barnes, whose families were sworn enemies. As the series progressed, Bobby's elder brother, oil tycoon J.R. Ewing, became the show's breakout character, whose schemes and dirty business became the show's trademark. When the show ended on May 3, 1991, J.R. was the only character to have appeared in every episode.