Guillaume de Mévius (born 4 August 1994) is a Belgian rally driver.

[2] In 2017, de Mévius won the Junior class of the Belgian Rally Championship.

[3] In 2021, de Mévius signed to drive for the Red Bull Off-Road Junior team in the T3 Light Prototype class, initially in the FIA World Cup for Cross-Country Rallies and later in the World Rally-Raid Championship after it was rebranded, and in individual events such as the Dakar Rally.

[4] In 2023, de Mévius remained a Red Bull driver, but instead moved to GRally Team, formed by himself and his brother Ghislain.

[5] The team did not register for the World Rally-Raid Championship, instead electing to participate in individual events.