Geoffrey Blancaneaux (born 8 August 1998) is a French professional tennis player who competes mainly on the ATP Challenger Tour.

Blancaneaux won the 2016 French Open boys' singles title, defeating Félix Auger-Aliassime in the final after saving three championship points.

In September 2017, Blancaneaux made his Grand Slam debut, after receiving a wildcard to enter the main draw at the US Open.

190 at the 2022 French Open he qualified to make his Grand Slam debut at this Major on his sixth attempt.

In February, Blancaneaux won his second Challenger title at the Delhi Open, defeating Coleman Wong in the final.