Clarence Bass (born 1937 in New Mexico) is an American writer, fitness expert, and retired lawyer. He is best known for his book and DVD series Ripped, which chronicle his fitness, including becoming a past-40 bodybuilding champion. Bass was a writer for Muscle & Fitness where he had a question and answer column. He has continued to write, documenting his fitness over a span of approximately 60 years in various books that he has released since 1980. He is featured in the books Second Wind and Legends of the Iron Game. In the June 2017 issue of Men's Health, Bass was named "one of America’s greatest fitness visionaries." He is an advocate of plant-based nutrition.

Bass was born in Albuquerque, New Mexico in 1937. His parents were both in the health field, one a doctor and the other a nurse.

He attended Albuquerque High School, where as a junior, he won the New Mexico State Championship in the pentathlon. He excelled in wrestling, placing second in the New Mexico State Championships his senior year. Although he began lifting weights at the age of 13, it was during high school that he began to get into Olympic lifting, which helped lead him into a career in health and fitness.

Bass earned an undergraduate in psychology from the University of New Mexico, then attended the University of New Mexico School of Law. While obtaining his Juris Doctor degree, he focused his athletics primarily on weightlifting, achieving a 275-pound Olympic press, a 245 snatch, and 325 clean and jerk with a body weight of 180 lbs. After graduation, he went on to practice law in Albuquerque.

Bass described his own diet as lacto-ovo-pescetarian.

Bass began his professional career as a lawyer practicing in Albuquerque. During his time as an attorney, he became prominent in the world of fitness and retired from the legal field in 1994 to concentrate on health and fitness full-time. While also working full-time as a lawyer, Bass entered numerous bodybuilding competitions and won numerous awards.

Bass entered his first bodybuilding competition in 1976. A year later in 1977, he measured a body fat percentage of 2.4%, measured using hydrostatic weighing at Lovelace Medical Center. His first successful competition was at the New Mexico Bodybuilding Championship in 1978, taking home the awards for "Best Legs" and "Most Muscular". The same year he began competing in the national Past 40 competitions, winning the AAU Past 40 Mr. America, short class. The next year he won his class in the AAU Past 40 Mr. USA, along with the overall awards for Best Legs, Best Abdominals, and Most Muscular Man. His final year of competition came in 1980, again competing in the Past 40 Mr. America. He placed 2nd in the middleweight class and subsequently retired from competition.

Bass was featured in the book Second Wind: The Rise of the Ageless Athlete. In the book, he addressed his reasons for retiring from competition, stating, “I had nothing to gain and everything to lose.” He added, “I developed my reputation with new photos [every few years] and these contests aren’t a lot of fun.”