Justine Hostekint is a French voice actress and stage performer with an extensive career in dubbing anime and animated series for the French market. Her professional background is rooted in live performance; she earned a master's degree in performing arts in 2006 and studied at the Conservatoire de Lille. She further specialized in clowning through a program at the Centre National des Arts du Cirque in Châlons-en-Champagne. While she remains active in theater, improvisation, and clown performances with various companies in Lyon, she has also worked extensively in recording studios providing voices for animation.

Hostekint's voice work covers a wide range of characters across numerous popular anime series. She is known for taking on multiple roles within the same franchise, demonstrating her vocal versatility. In the Sword Art Online series, she provided the French voices for Yolko, Lisbeth (Rika Shinozaki), and Alicia Rue. She voiced the characters Firo Prochainezo and Gretto Avaro in Baccano!. Her repertoire also includes the role of Caster in Fate/stay night and Shinji Kazama in Full Metal Panic! The Second Raid.

Her work encompasses a variety of genres and character types. She voiced the title character Hayate Ayasaki in the first season of Hayate the Combat Butler and Hikari Hanazono in Special A. In the psychological horror series When They Cry, she took on the role of Miyo Takano. Her credits also include characters in Death Parade (Quin, Chisato Miyasaki), Kids on the Slope (Seiji Matsuoka), and The Tatami Galaxy (Hanuki). In the Broken Blade franchise, she voiced both Regatz Arrow and Narvi Stryze. While primarily known for anime, she has also contributed to other animated projects, such as voicing Yuniko Kouzuki in the French dub of the series Accel World.