World number 1 ranked female tennis players

World number 1 ranked female tennis players is a year-by-year listing of the female tennis players who were ranked as world No. 1 by various contemporary and modern sources.

Notes:

• The Women's Tennis Association introduced a computerized ranking system in November 1975, which is incorporated into this list.
• The International Tennis Federation's year-end number 1 classification that was introduced in 1978 is no longer named as such, and has evolved into the ITF World Champion designation and award.
• The Women's Tennis Association has awarded a WTA Player of the Year award each year since 1977.