Benoît Guy Robert Costil (born 3 July 1987) is a French professional footballer who plays as a goalkeeper for Ligue 1 side Bordeaux and the France national football team.
Born in Caen, Costil started his career at SM Caen in Ligue 1 but only made a 10 performances for the club before being sent on loan in the 2008–2009 season to Vannes Olympique Club in Ligue 2.
On 17 June 2009, Sedan signed Costil from Caen until June 2011. In two years at Sedan he made 76 appearances and was elected best goalkeeper of Ligue 2 for the 2010–2011 season.
On 14 June 2011, he signed a three-year contract for Rennes after his contract with Sedan expired. This transfer means he returns to Ligue 1 for the first time since the handful of appearances he made at Caen at the beginning of his career.
Costil was a France U-21 international having participated in the 2008 Toulon Tournament.
On 6 November 2014, Costil was called up to France manager Didier Deschamps' 23-man squad for friendly matches against Albania and Sweden.
On 12 May 2016, Costil was called up to France manager Didier Deschamps' 23-man squad for UEFA Euro 2016 as the third goalkeeper behind captain Hugo Lloris and Steve Mandanda.
He made his debut on 15 November against Ivory Coast, playing the whole game in a 0–0 home draw.
On May 17 2018, he was named on the standby list for the 23 man French squad for the 2018 World Cup in Russia.