Helen Jane Long (born April 10, 1974) is a British composer, musician and pianist, best known for various advertisement contracts, her work on several film projects in a variety of genres, and, most recently, her contemporary-classic piano album, Embers (2010) (BLE) and Porcelain (Warner Music Group). In 2003, Long worked as music assistant to Howard Shore on the film score for The Lord of the Rings trilogy. Long composed the original music for the movie thrillers The Only Hotel and Surveillance 24/7.

Long was born on April 10, 1974 in Hampshire, England. She began training as a classical pianist at age 4, moving on to also learn clarinet, guitar, cello, vocals, organ, and violin.

Long began composing when she entered college. However, frustrated with the progression of her music degree, she claims she spent her entire student loan on a huge sequencer keyboard. She then slowly continued to amass the equipment needed for a fully operational home recording studio. There she independently practiced recording, producing, scoring, arranging, and mixing.

After college Long began working for the BBC on the children's shows Blue Peter and Live & Kicking, where she periodically worked with Ronnie Hazlehurst (composer for Only Fools and Horses), Dennis King of Black Beauty, and Nigel Hess (composer of the film Ladies in Lavender). She has also worked with composers Jerry Goldsmith and Ron Goodwin. She was signed to a major label soon after sending out demos of her material. Long has since written scores, piano pieces, and full orchestrations for many films and television spots.

In 2003 Long served as a music score assistant for composer Howard Shore on the historic film trilogy The Lord of the Rings, as well as the extended DVDs. Long, who had met Shore before the films, served essentially as his personal copy editor for the sheet music he wrote daily for new scenes. She was also known on set for reliably supplying brownies and pancakes.

She is well known for scoring the often played Volkswagen Passat commercials in 2005. Since 2005 she has scored a large amount of for-television documentaries on Channel 4, Channel 5, the Discovery Channel, and the BBC, including Behind the Da Vinci Code and Open Gardens in 2008. She has also scored several short films and the feature films The Only Hotel and Surveillance (2007). She has done several recordings with the Royal Philharmonic Orchestra, notably in 2007 when she worked with them to compose and record a music CD of orchestral music.