[1] He made his acting debut in the two-part television miniseries La dame d'Izieu in 2007, followed by films such as LOL (Laughing Out Loud) (2008), The Army of Crime (2009), Romantics Anonymous (2010) and Just Like Brothers (2012).

He also co-created, co-wrote and starred in the Netflix comedy miniseries Fiasco (2024), and portrayed Edmond Dantès in The Count of Monte Cristo (2024).

[1] He made his acting debut in the two-part television miniseries La dame d'Izieu in 2007, followed by films such as LOL (Laughing Out Loud), The Army of Crime, Romantics Anonymous and Comme des frères.

[4] In 2014, Niney starred as fashion designer Yves Saint Laurent in the biopic of the same name directed by Jalil Lespert, for which he won a César Award for Best Actor.

[6][7] In 2024, Niney portrayed Edmond Dantès in the film The Count of Monte Cristo, and also starred in Fiasco, a 7-episode comedy miniseries that he co-created and co-wrote with Igor Gotesman for Netflix.