Some of my favs ("Open Range", "True Grit" (remake), "Unforgiven" and "The Shootist" already having been mentioned:
•”Hostiles” (2017) Christian Bale, Rosamund Pike, Wes Studi, Adam Beach
•”Valdez is Coming” (1971) Burt Lancaster, Frank Silvera, Susan Clark
•”The Oxbow Incident” (1942) Henry Fonda, Harry Morgan, Dana Andrews, Anthony Quinn
•”Lonesome Dove”(1989 mini-series) Robert Duvall, Tommy Lee Jones,Danny Glover, Diane Lane, Robert Urich, Chris Cooper, Anjelica Huston, Barry Corbin
•”Broken Trail” (2006) Robert Duvall, Thomas Haden Church, Chris Milky, Gwendoline Yeo, Olivia Cheng, Caroline Chan, Valerie Tian, Jadyn Wong
•”The Missing” (2003) Cate Blanchett, Tommy Lee Jones, Val Kilmer
•”The Gunfighter” (1950) Gregory Peck, Millard Mitchell, Carl Malden, Skip Homier, Richard Jaeckal
•”Last Train From Gun Hill” (1950) Kirk Douglas, Anthony Quinn, Earl Holliman, Carolyn Jones, Walter Sande
•”Hombre” (1967) Paul Newman, Richard Boone, Martin Balsam, Frederick March, Frank Silvera
•”The Missouri Breaks” (1976) Jack Nicholson, Harry Dean Stanton, Marlon Brando, Randy Quaid
•”Pale Rider” (1985) Clint Eastwood, Michael Moriarty, Carrie Snodgrass, John Russel, Richard Kiel
•”Joe Kidd” (1972) Clint Eastwood, Robert Duvall, John Saxon, Don Stroud, Stella Garcia
•”Outlaw Josie Wales” (1976) Clint Eastwood, Chief Dan George, Bill McKinney, John Vernon
•”Tom Horn” (1980) Steve McQueen, Linda Evans, Richard Farnsworth, Slim Pickens, Elisha Cook Jr.
•”The Black Robe” (1991) Lothaire Bluteau, Tantoo Cardinal
•”Deadwood” (series…2004-2006) Timothy Olyphant, Ian McShane, Brad Dourif, W. Earl Brown, Titus Welliver, Molly Parker, Paula Malcomson, Jim Beaver, etc.
•”Red Sun” (1971) Charles Bronson, Toshiro Mifune, Ursula Andress
Western-Themed:
•”Longmire” (series…2012-2017) Robert Taylor, Lou Diamond Phillips, Katee Sackoff, Cassidy Freeman, A Martinez, Zahn McClarnon, Graham Greene, Gerald McRaney
•”Thunderheart” (1992) Val Kilmer, Graham Greene, Sam Shepard
•”The Three Burials of Melquiades Estrada” (2005) Tommy Lee Jones, Barry Pepper, Dwight Yoakam, Levon Helm
•”A Night in Old Mexico” (2013) Robert Duvall, Jeremy Irvine, Angie Cepeda, Billy Joe Shaver