Marvin Richard James Humes (born 18 March 1985 in Greenwich, London, England) is the oldest member of the band. He was previously a member of another band called VS, created by Blue member Simon Webbe. He appeared in Holby City for three years from 2000 to 2003, playing the character Robbie Waring and at the age of 14 he starred in a children's programme called K-Club. On 27 July 2012 he married Rochelle Wiseman at Blenheim Palace, and on 20 May 2013, she gave birth to their daughter Alaia-Mai.
Aston Merrygold (born 13 February 1988 in Peterborough, England). He is one of seven children; he has five brothers and one sister. He was born and raised in Peterborough, where he attended Jack Hunt School. In 2002, he entered Stars in Their Eyes where he appeared as Michael Jackson, singing "Rockin' Robin" finishing in second place. After leaving school he was cast in Fun Song Factory playing the character "Cookie". He played football at school and his initial aspiration was to play professionally.
Oritsé Jolomi Matthew Soloman Williams (born 27 November 1986) attended St Edwards School in West London. He has two brothers and one sister. He attended the British International School in Lagos, Nigeria, he also attended Larmenier Sacred Heart Catholic Primary School and Cardinal Vaughan Memorial School. He decided to put together his own boy band, UFO, who later became JLS. He also wrote the song "Wow Oh Wow" for Jedward. In September 2013, Williams won the first series of the ITV dancing show Stepping Out, hosted by Davina McCall.
Jonathan Benjamin "JB" Gill (born 7 December 1986) spent the first five years of his life living in Antigua. He grew up in Croydon and began making music at the age of seven when he played the recorder, piano, flute and guitar, later studying at The Centre for Young Musicians (CYM). He was involved with London Irish rugby club until he was 18. He studied theology at King's College London, before leaving to pursue a music career. In December 2012, he won the Christmas Special edition of the BBC program Strictly Come Dancing.