Islam Belouizdad (born in Hassi Messaoud, Algeria on 16 December 1987) better known as Hayce Lemsi is an Algerian-French rapper and singer. He has also used the stage names L'insomniak, La Kalash Humaine, Big Lemsi and Biko Loco.

He started his career in 2008 presenting his freestyle online and on radio. He released his debut mixtape Un petit pas pour Lemsi in 2012 followed by his breakout mixtape Électron libre in 2013. In 2015 he released his debut studio album titled L'or des rois on Capitol Records. In 2017 he released his mixtape Électron libre 2 as a follow-up to Électron libre. He also has a joint album À des années lumières in collaboration with his biological brother Volts Face.

In 2015, he launches his own independent music label Triangle d'or, later renamed in Big Lemsi Record.