See main article: article and 2018 St. Petersburg Ladies' Trophy.
Jeļena Ostapenko and Alicja Rosolska were the defending champions, but Ostapenko chose not to participate this year. Rosolska played alongside Lara Arruabarrena, but lost in the first round to Alla Kudryavtseva and Katarina Srebotnik.
First-time pairings Timea Bacsinszky and Vera Zvonareva won the title, defeating Kudryavtseva and Srebotnik in the final, 2–6, 6–1, [10–3].