Robert William "Dabbs" Greer (April 2, 1917 – April 28, 2007) was an American character actor in film and television for over 60 years. Greer appeared in nearly 100 film roles and in nearly 600 television episodes of various series. He played Mr. Jonas in Gunsmoke, Coach Ossie Weiss in the sitcom Hank and Reverend Robert Alden in Little House on the Prairie. Greer's final film role was as the 108-year-old Paul Edgecomb, the older version of Tom Hanks' character, in the 1999 film The Green Mile (based on the 1996 novel of the same name by Stephen King).

He appeared in two episodes of the original series in 1964:

• "The Children of Spider County" - Mr. Bishop
• "The Inheritors, Part I" - E. F. Larkin