2021 St. Petersburg Ladies' Trophy – Doubles

Shuko Aoyama and Ena Shibahara were the defending champions, but they decided not to participate this year.

Nadiia Kichenok and Raluca Olaru won the title, defeating Kaitlyn Christian and Sabrina Santamaria in the final, 2–6, 6–3, [10–8].

Seeds
• # 🇺🇦 Nadiia Kichenok / 🇷🇴 Raluca Olaru (champions)

• # 🇺🇸 Kaitlyn Christian / 🇺🇸 Sabrina Santamaria (final)

• # 🇯🇵 Makoto Ninomiya / 🇨🇿 Renata Voráčová (quarterfinals)

• # 🇧🇾 Lidziya Marozava / 🇧🇾 Aliaksandra Sasnovich (quarterfinals)