Women's professional sports are a relatively new phenomenon, having largely emerged within the latter part of the 20th century. Unlike amateur female athletes, professional female athletes are able to acquire an income which allows them to earn a living without requiring another source of income. In international terms, most top female athletes are not paid and work full-time or part-time jobs in addition to their training, practice, and competition schedules. Professional organizations for women in sport are most common in developed countries where there are investors available to buy teams and businesses which can afford to sponsor them in exchange for publicity and the opportunity to promote a variety of their products. Very few governments support professional sports, male or female. Today there are a number of professional women's sport leagues in the United States and Canada.

In professional sports, as opposed to amateur sports, participants receive payment for their performance. Professionalism in sport has come to the fore through a combination of developments. Mass media and increased leisure have brought larger audiences, so that sports organizations or teams can command large incomes. As a result, more sportspeople can afford to make sport their primary career, devoting the training time necessary to increase skills, physical condition, and experience to modern levels of achievement. This proficiency has also helped boost the popularity of sports. In most sports played professionally there are many more amateur than professional players, though amateurs and professionals do not usually compete.