Jamar Rolando McNaughton Jr (born 10 October 1992 in Spanish Town, St. Catherine, Jamaica), popularly known as Chronixx, is a Jamaican reggae artist. His stage name replaced the name "Little Chronicle" which he was given because of his father, the singer "Chronicle".

Chronixx and his music has been branded as a "Reggae Revival," alongside other reggae musicians including Dre Island, Jah Bouks, Jah9, Protoje, Kelissa and Kabaka Pyramid, his lyrical content revolves around themes of anti-war, romantic declarations and resiliency.

He started his recording career in 2003 at the age of 11, and went on to provide harmony vocals for artists such as Lutan Fyah as well as beginning production work, creating rhythms used by artists such as Konshens.

At the age of 14, he began producing and building riddims. In 2009 Chronixx's brother died which led to him writing with Romaine 'Teflon' Arnett of Zincfence Records.His popularity grew throughout 2012, with significant airplay in Jamaica, and performances at festivals as well as a featuring on the Major Lazer-curated mixtape Start a Fire.

His EP, Dread & Terrible, was released on 1 April 2014, and topped the Billboard Top Reggae Albums charts on the week of 18 April.