Rosemary "Rosie" Casals (born September 16, 1948) is a former American professional tennis player.
Rosemary Casals earned her reputation as a rebel in the tennis world when she began competing in the early 1960s.
During a tennis career that spanned more than two decades, she won more than 90 tournaments, and was a motivating force behind many of the changes that occurred in women's tennis during the 1960s and 1970s.