Milton Teagle "Richard" Simmons (July 12, 1948 – July 13, 2024) was an American fitness instructor and television personality. He was a promoter of weight-loss programs, most prominently through his Sweatin' to the Oldies line of aerobics videos.

Simmons began his weight-loss career by opening his gym Slimmons in Beverly Hills, California, catering to the overweight, and he became widely known through exposure on television and through the popularity of his consumer products. He was often parodied and was a frequent guest of late-night television and radio talk shows, such as the Late Show with David Letterman and The Howard Stern Show.

He continued to promote health and exercise through a decades-long career, and later broadened his activities to include political activism, such as in 2008 in support of a bill mandating noncompetitive physical education in public schools as a part of the No Child Left Behind Act.