The Avon Championships World Championship Series was the elite tour for professional women's tennis organised by the Women's Tennis Association (WTA).

It included the four Grand Slam tournaments and a series of other events.

ITF tournaments were not part of the tour, although they awarded points for the WTA World Ranking.

Points were allocated based on these categories and the finishing position of a player in a tournament.

[1] The points allocation, with doubles points listed in brackets, is as follows: Below are the 1981 WTA year-end rankings (December 31, 1981) in both singles and doubles competition: Women's World Tennis circuit|1923]]