Alcest is a French post-black metal band from Bagnols-sur-Cèze, founded and led by Neige (Stéphane Paut). It began in 2000 as a black metal solo project by Neige, then became a trio, but members Aegnor and Argoth left the band following the 2001 release of their first demo, leaving Neige as the sole member. Neige began incorporating elements of shoegaze and post-metal into the project's sound from 2005 onwards and is largely credited with pioneering the fusion genre known as blackgaze. In 2009, drummer Winterhalter from Les Discrets joined Alcest, after eight years with Neige as its sole full-time member.

Since its creation, Alcest has released seven studio albums and a number of EPs and split releases. Their fourth album, 2014's Shelter, marked a dramatic shift towards a distinctly shoegaze sound, while their subsequent album Kodama (2016) marked a return to their earlier blackgaze sound. The band are widely credited with pioneering the blackgaze/post-black metal genre, particularly with their 2005 EP Le secret.