See main article: article and 2018 L'Open 35 de Saint-Malo.
Diāna Marcinkēviča and Daniela Seguel were the defending champions, but Seguel chose not to participate.
Marcinkēviča partnered alongside Alexandra Cadanțu, but lost in the final to Cristina Bucșa and María Fernanda Herazo, 4–6, 6–1, [10–8].