Clair Obscur: Expedition 33 features a soundtrack composed by Lorien Testard, who created 154 tracks totaling over eight hours of music. The soundtrack has surpassed 1.5 million streams and was the number one selling album on Bandcamp last week. Testard was discovered by the game's director, Guillaume Broche, through Soundcloud. Lead writer Jennifer Svedberg-Yen initially auditioned for a voice acting role after responding to a Reddit post by Broche and later transitioned to her current role. Broche credits the Covid-19 pandemic for helping him find talented individuals online, allowing the game to compete with larger-budget titles despite having a mostly junior team.