2021 L'Open 35 de Saint-Malo – Doubles

Paula Kania-Choduń and Katarzyna Piter were the defending champions but chose not to participate.

Kaitlyn Christian and Sabrina Santamaria won the title, defeating Hayley Carter and Luisa Stefani in the final, 7–6(7–4), 4–6, [10–5].

Seeds
• # 🇺🇸 Hayley Carter / 🇧🇷 Luisa Stefani (final)

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

• # 🇷🇺 Anna Kalinskaya / 🇷🇺 Yana Sizikova (quarterfinals)

• # 🇧🇾 Lidziya Marozava / 🇷🇴 Andreea Mitu (first round)