Billie Jean King Cup
| Current season, competition or edition: 2025 Billie Jean King Cup | |
| Sport | Tennis |
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| Founded | 1963 |
| No. of teams | 8 (World Group) 99 (total 2016) |
| Countries | ITF member nations |
| Most recent champion(s) | Italy (5th title) |
| Most titles | United States (18 titles) |
| Official website | billiejeankingcup.com |
| Women's pro tennis |
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The Billie Jean King Cup (or the BJK Cup) is the premier international team competition in women's tennis, launched as the Federation Cup in 1963 to celebrate the 50th anniversary of the International Tennis Federation (ITF). The name was changed to the Fed Cup in 1995, and changed again in September 2020 in honor of former World No. 1 Billie Jean King. The Billie Jean King Cup is the world's largest annual women's international team sports competition in terms of the number of nations that compete. The current chair is Katrina Adams.
The men's equivalent of the Billie Jean King Cup is the Davis Cup, and the Czech Republic, Australia, Russia, Italy and the United States are the only countries to have won both Cups in the same year.