See main article: article and 2021 Moselle Open.
Robert Lindstedt and Jan-Lennard Struff were the reigning champions from when the tournament was last held in 2019,[1] but chose not to participate this year.
Hubert Hurkacz and Jan Zieliński won the title, defeating Hugo Nys and Arthur Rinderknech in the final, 7–5, 6–3.