James Jacob Lomas (born 1 March 1990) is a British actor best known for his role as Billy Elliot in Billy Elliot the Musical, which earned a Laurence Olivier Award for Best Actor in a Leading Role in a Musical, making him one of the youngest winners of the awards.

Together with his two original colleagues Liam Mower and George Maguire, alternating in the role of "Billy", he performed again in a first anniversary Gala show on 12 May 2006.

In July 2006 he played the title role of young blind Nicholas Saunderson in the new musical No Horizon in Penistone, northern England and was well received for his performances.

Lomas gained a place at the Millennium dance and drama school in London, where he began his studies from September 2006 onwards.

After leaving drama school Lomas appeared in Dirty Dancing, as a swing and understudy for Jordan, toured with Joseph and the Amazing Technicolor Dreamcoat understudying Joseph and played Espresso in Starlight Express in Bochum, Germany.