Ronald Earle Glass (July 10, 1945 – November 25, 2016) was an American actor. He was known for his roles as literary Det. Ron Harris in the television sitcom Barney Miller (1975–1982), and as the spiritual shepherd, Shepherd Book, in the science fiction series Firefly (2002) and its sequel film Serenity (2005).

Early life
Glass was born in Evansville, Indiana, the son of Lethia and Crump Glass.

After graduating from St. Francis Seminary in 1964, Glass attended the University of Evansville, where he received a Bachelor of Arts, double majoring in drama and literature. Years later, the university awarded him its Medal of Honor. Glass said in 2007 he knew while he was in college that he wanted to act. With a teacher's encouragement, he performed in a play and went on to an acting career.