Jonathan Breyne (born 4 January 1991) is a Belgian cyclist who last rode for Tarteletto–Isorex.In 2013, Breyne was accused of using illegal drugs following the discovery of clenbuterol in a sample taken following his participation in the Japan Cup.
Breyne was cleared by the Union Cycliste Internationale, who accepted the drug had entered his system as a result of eating contaminated meat while taking part in a race in China.