Nicolas Isimat-Mirin Charente (born 15 November 1991) is a French professional footballer who plays as a central defender for Turkish club Beşiktaş.
Isimat-Mirin was born in Meudon, in the southwestern suburbs of Paris, to Guadeloupean parents. He began his career at France at Roissy-en-Brie. He is a graduate of the Clairefontaine football academy.
After his departure from Clairefontain, Isimat-Mirin joined Rennes and spent two seasons at the club before transferring to Valenciennes in 2009. He spent the 2009–10 season playing on the club's Championnat de France amateur 2 team. In September 2010, he was promoted to the first team by manager Philippe Montanier. On 21 September 2010, Isimat-Mirin made his professional debut in a Coupe de la Ligue match against Nîmes Olympique appearing as a substitute. Valenciennes won the match 5–4 on penalties. On 19 October, Isimat-Mirin signed his first professional contract agreeing to a three-year deal until July 2014.