Mathias Beche Aussel (born 28 June 1986 in Geneva) is a Swiss-French professional racing driver who currently competes in the European Le Mans Series for Richard Mille by TDS.

Rebellion's LMP1 programme would become the permanent home for Beche during the next two seasons, which started with an LMP1-L class win (for non-hybrid powered teams) at the 24 Hours of Le Mans alongside Nico Prost and Nick Heidfeld and the eventual LMP1-L title in 2014.

[4][5] The team withdrew from the opening two races of the 2015 season to finalise work on their new Rebellion R-One, but once they entered, Beche and Prost took two privateer class wins to become champions.

[16] His #13 entry was hampered by disqualifications at Le Mans, where a miraculous overall podium (and second place in class) was taken away by the team's "unnecessary modification of approved bodywork", and Fuji, which saw a heated battle between Beche and Jean-Éric Vergne come to a head before Rebellion were excluded for a drive time violation.

[20] The team started off with two third places, including a class podium at Le Mans, before a disqualification for both Toyotas earned Beche and his teammates victory at Silverstone.

[21][22] However, Beche moved to the sister car for the round at Sebring and left the team with two races to go, meaning that he finished sixth in the championship — three places behind Menezes and Laurent.

[23][24][25] Beche would make the LMP2 Pro-Am category his home in 2022, driving for TDS Racing x Vaillante alongside rookie Tijmen van der Helm and amateur driver Philippe Cimadomo in the ELMS.

[28] Beche switched to Nielsen Racing for the 2023 ELMS season, where he, Ben Hanley and Rodrigo Sales finished fourth in the Pro-Am classification with three class podiums.