The 2005 world champion in the 125cc class will be partnered at the team by current Moto2 championship leader Franco Morbidelli of Italy.
Luethi was also previously a test rider for KTM before their MotoGP debut this season.
"His consistency over seven seasons in Moto2 has been incredible, with a sixth place in 2013 the only time he's finished outside the top five in the championship," Marc VDS team boss Marc van der Straten said in a statement.
(Reporting by Alan Baldwin in Spa-Francorchamps; Editing by John O'Brien)
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