Charles Cooper made four guest appearances in THE RIFLEMAN, portraying different characters in each episode. He played Hank Fulton in "End of a Young Gun" (episode 3), Rudy Crofts in "The Stand-In" (episode 114), Matt Yordy in "Honest Abe" (episode 118), and Larsen, the Bartender in "I Take This Woman" (episode 148).

Richard Devon made seven guest appearances in THE RIFLEMAN, portraying different characters in each episode. He played Jethroe in "Blood Brothers" (episode 35), Austin Stark in "The Spiked Rifle" (episode 49), Walt Ryerson in "The Grasshopper" (episode 63), Jack Adams in "Miss Milly" (episode 84), Ben Macowan in "The Silent Knife" (episode 89), Gus Potter in "The Stand-In" (episode 114), and Lovett, the Gunslinger, in "The Most Amazing Man" (episode 151).

Dabbs Greer was an American actor who had a prolific career spanning more than 50 years.   A highly recognizable character actor—the quintessential everyman—he played a wide range of supporting roles in film and television.  Originally from Missouri, his southern accent lent authenticity to the rural characters he often portrayed, especially in Westerns.  Frequently cast as a minister, his most memorable role may have been Reverend Alden in "Little House on the Prairie" (1974–1983).

Greer made his film debut in the 1938 feature "Jesse James."  He appeared in the 1958 film noir "I Want to Live" and reprised a similar role in the 1999 film, "The Green Mile," in which he played the Tom Hank's character, Paul Edgecomb, as an elderly man.  

Greer appeared in several recurring roles in popular television series in the 1950's and 1960's, including THE RIFLEMAN, in which he guest-starred eight times: he portrayed Marcus Trimble in "Outlaw's Inheritance" (episode 38), Sam Elder in "Boomerang" (episode 39), Brett in "Panic" (episode 47), Farley Steele Weaver in "The Jailbird" (episode 73), Jack Scully in "The Promoter" (episode 87), Finny in "The Wyoming Story, Parts I and II" (episodes 96 and 97), and Taylor, a prison guard in "The Stand-In" (episode 114).

Greer's recurring roles in other popular TV series included "Hank" (1965–1966), in which he played track coach Ossie Weiss, The Ghost & Mrs. Muir" (1968-–1970), as Sheriff Norris "Norrie" Coolidge, and in"Gunsmoke" (1955–1975) as storekeeper Wilbur Jonas.