Sundown Slim is a 1920 American silent Western film starring Harry Carey.

The adjoining sheep ranch is owned by David Loring (Duke R. Lee).

Fadeaway (Charles Le Moyne), a bad cowboy, insults Anita (Mignonne Golden), daughter of the chief sheepherder, and Sundown exacts reprisal.

Billy (Ted Brooks), Sundown's pal, is induced by Fadeaway to rob a bank.

The two learn to care for each other, and when Sundown is released from jail and goes to Anita, he sees the situation and surrenders her to Billy, again taking up to lone trail.