The 2020–21 Billie Jean King Cup was the 58th edition of the international women's tennis team's tournament and the first to be styled as the Billie Jean King Cup.
For this edition, the format of the cup was changed.[1] The main modification is the World Group taking place at one location and in one week, with twelve teams divided in four round-robin groups of three teams each, with the winners of each group advancing to the semi-finals. The series between the teams in this stage featured two singles matches and one doubles match. As the World Group takes place as one single tournament, the event has been named the Billie Jean King Cup Finals. The lower zone groups I, II and III were composed of round-robin group play deciding promotion or relegation.
This edition was played over two years because of the COVID-19 pandemic: The Finals were originally scheduled to be held 17 to 18 April 2020 but were postponed to the following year and finally took place in November 2021.
Date: 1–6 November 2021
Venue: O2 Arena, Prague, Czech Republic
Surface: Hard (i)
12 nations took part in the Finals, formerly known as World Group. The qualification was as follows:
Date: 7–8 February 2020
Sixteen teams played for eight spots in the Finals, in series decided on a home and away basis.[1]
These sixteen teams were:
The 8 losing teams from the qualifying round played the new play-offs, which ranked the 8 nations that were promoted from the Regional Group I from Americas, Europe/Africa and Asia/Oceania, to see who had to play the 2022 Qualifiers and who stayed in the Regional Group I in 2022.
#: Nations Ranking as of 29 June 2019.
United States (2019 Quarterfinalist, #2)
Belarus (2019 Semifinalist, #5)
Romania (2019 Semifinalist, #6)
Germany (2019 Quarterfinalist, #7)
Spain (2019 WG play-off winner, #8).svg/1280px-Flag_of_Switzerland_(Pantone).svg.png){kind=small}
Switzerland (2019 WG play-off loser, #9).svg/1280px-Flag_of_Belgium_(civil).svg.png){kind=small}
Belgium (2019 Quarterfinalist, #10)
Great Britain (2019 WG II play-off winner, #11)
Latvia (2019 WG play-off loser, #12).svg/1280px-Flag_of_Canada_(Pantone).svg.png){kind=small}
Canada (2019 WG play-off loser, #13)
Japan (2019 WG II play-off winner, #14)
Slovakia (2019 WG II play-off winner, #15)
RTF(2019 WG II play-off winner, #16)
Kazakhstan (best ranked WG II play-off loser, #17)
Brazil (2nd best ranked WG II play-off loser, #18)
Netherlands (3rd best ranked WG II play-off loser, #19)T = Ties, M = Matches, S = Sets
Date: 16–17 April 2021
Sixteen teams played for eight spots in the 2021 qualifying round, in series decided on a home and away basis.[1]
These Sixteen teams were:
Eight winners advanced to the 2022 qualifying round and eight losers contest regional Group I event in 2022.
Brazil, Japan and Romania were relegated to Zonal Group I in 2022.
Poland,
Ukraine and 
Italy were promoted to Final qualifying round in 2022.Venue: Club Palestino, Santiago, Chile (clay)
Dates: 5–8 February 2020
Mexico and 
Argentina were promoted to the 2020 Billie Jean King Cup Play-offs.
Venezuela and 
Peru were relegated to Americas Zone Group II in 2022.Venue 1: Centro de Alto Rendimiento Fred Maduro, Panama City, Panama (clay)
Venue 2: Club de Tenis La Paz, La Paz, Bolivia (clay)
Dates: 23–26 June 2021 (Panama City) and 27–30 October 2021 (La Paz)
Venue: Aviation Club Tennis Centre, Dubai, United Arab Emirates (hard)
Dates: 3–7 March 2020
Promotions
China and 
India were promoted to the 2020 Billie Jean King Cup Play-offs.
Uzbekistan and 
Chinese Taipei were relegated to Asia/Oceania Zone Group II in 2022.Venue 1: Renouf Tennis Centre, Wellington, New Zealand (hard)
Venue 2: Sri Lanka Tennis Association Complex, Colombo, Sri Lanka (clay)
Dates: 4–8 February 2020 (Wellington)
Due to COVID-19 restrictions, the event in Sri Lanka could not be held. The Billie Jean King Cup committee decided that in light of the challenges of identifying and appointing a new host nation during the remainder of the 2021 tennis season, the event would take place in 2021. The seven competing nations, Hong Kong China, Iran, Malaysia, Oman, Sri Lanka, Tajikistan and Vietnam, remained in Asia/Oceania Group II, and they competed in the 2022 competition.
New Zealand was promoted to Asia/Oceania Zone Group I in 2022.Venue 1: Tallinn Tennis Center, Tallinn, Estonia (indoor hard)
Venue 2: Centre National de Tennis, Esch-sur-Alzette, Luxembourg (indoor hard)
Dates: 5–8 February 2020
Ukraine, Italy, 
Serbia, and Poland were promoted to the 2020 Billie Jean King Cup Play-offs.
Greece and 
Luxembourg were relegated to Europe/Africa Zone Group II in 2022.Venue: Tali Tennis Center, Helsinki, Finland (indoor hard)
Dates: 4–7 February 2020
Georgia and 
Denmark were promoted to Europe/Africa Zone Group I in 2022.
Moldova and 
Portugal were relegated to Europe/Africa Zone Group III in 2022.Venue: SEB Arena, Vilnius, Lithuania (indoor hard)
Dates: 15–19 June 2021
