Gautier Serre (born June 5, 1984), better known by his stage name Igorrr, is a French musician. Under the Igorrr alias, he combines a variety of disparate genres, including black metal, baroque music, breakcore, and trip hop, into a singular sound. Serre is also part of the groups Whourkr and Corpo-Mente. In 2017, the Igorrr project became a full band with the addition of vocalists Laurent Lunoir and Laure Le Prunenec, and drummer Sylvain Bouvier.

Serre plays piano, drums, and guitar and primarily uses Steinberg Cubase for recording. He named his band after a pet gerbil called Igorr that he had as a child, adding the extra "r" to "make it harder to pronounce." Serre claims to have synesthesia, in his case perceiving music as colors.

Igorrr's sound combines breakbeats, heavy metal riffs, extreme tempo changes, and operatic singing coupled with screaming/growling, among other elements, to create what AllMusic describes as "an intense, disturbing, and undeniably distinct experience". The project's musical sources include black metal, death metal, industrial metal, progressive metal, classical music (especially Baroque music), Balkan music, breakcore, and trip hop. It has provoked labels such as "Baroquecore" and has been described as Dadaist.