text: Jared Martin (seasons 3–6, 8–9, and 14) as Sue Ellen's cowboy lover and Clayton's adoptive son, Steven "Dusty" Farlow;
  William Smithers (seasons 4–5 and 8–12) as Jeremy Wendell, villainous WestStar Oil frontman who tries to conquer Ewing Oil;
  Leigh McCloskey (seasons 4–5, 8 and 12) as medical student Mitch Cooper, Lucy's on-off husband;
  Audrey Landers (seasons 4–8 and 12–13) as Mitch's sister Afton Cooper, an aspiring singer and Cliff's longtime girlfriend;
  Priscilla Pointer (seasons 4–6) as Rebecca Barnes Wentworth, Pam and Cliff's estranged mother;
  Morgan Brittany (seasons 5–8 and 11) as Rebecca's daughter Katherine Wentworth, Pam and Cliff's psychotic half-sister who falls madly in love with Bobby;
  John Beck (seasons 6–7 and 9) as Mark Graison, Pam's lover and eventual fiancé after her first divorce from Bobby;
  Miss USA winner Deborah Shelton (seasons 8–10) as model Mandy Winger, girlfriend of Cliff Barnes; longtime mistress of J.R.;
  Jenilee Harrison (seasons 8–10) as Jamie Ewing Barnes, Jack's sister who eventually enters into an ill-fated marriage with Cliff Barnes;
  Andrew Stevens (seasons 11–12) as Casey Denault, a young hustler who works for J.R., romancing Lucy and April in order to get to their money:
  Leigh Taylor-Young (seasons 11–12) as Kimberley Cryder, the wife of a WestStar oil executive that J.R. romances to further his business empire;