2021 WTA Finals – Doubles

Barbora Krejčíková and Kateřina Siniaková defeated Hsieh Su-wei and Elise Mertens in the final, 6–3, 6–4 to win the doubles tennis title at the 2021 WTA Finals.

Tímea Babos and Kristina Mladenovic were the two-time reigning champions, but failed to qualify this year.

Krejčíková and Siniaková clinched the year-end no. 1 as a team with their win against Sharon Fichman and Giuliana Olmos in their first round-robin match, and Siniaková secured the individual year-end no. 1 ranking by winning the title. Hsieh was also in contention for the top ranking.

Seeds
• # 🇨🇿 Barbora Krejčíková / 🇨🇿 Kateřina Siniaková (champions)

• # 🇯🇵 Shuko Aoyama / 🇯🇵 Ena Shibahara (semifinals)

• # Hsieh Su-wei / 🇧🇪 Elise Mertens (final)

• # 🇺🇸 Nicole Melichar-Martinez / Demi Schuurs (semifinals)

• # 🇦🇺 Samantha Stosur / 🇨🇳 Zhang Shuai (round robin)

• # Alexa Guarachi / 🇺🇸 Desirae Krawczyk (round robin)

• # Darija Jurak /  Andreja Klepač (round robin)

• # 🇨🇦 Sharon Fichman / 🇲🇽 Giuliana Olmos (round robin)

Alternates
• # 🇺🇦 Nadiia Kichenok / 🇷🇴 Raluca Olaru (Did not play)

• # 🇨🇿 Marie Bouzková / 🇨🇿 Lucie Hradecká (Did not play)

Group Tenochtitlán
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-player ties, head-to-head records; 4. in three-player ties, (a) percentage of sets won (head-to-head records if two players remain tied), then (b) percentage of games won (head-to-head records if two players remain tied), then (c) WTA rankings.''