The Billie Jean King Cup, abbreviated as 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.