Rachel Mary Berkeley Portman, OBE (born 11 December 1960) is an English composer who is best known for scoring films.

Portman's career in music began with writing music for drama in BBC and Channel 4 films such as Oranges Are Not the Only Fruit, Mike Leigh's Four Days in July and Jim Henson's Storyteller series.

Since then, Portman has written over 100 scores for film, television and theatre.

Her other works include a children's opera, The Little Prince (which was later adapted for television) and Little House on the Prairie, a musical based upon the Laura Ingalls Wilder books Little House on the Prairie (2008). Portman was commissioned to write a piece of choral music for the BBC Proms series in August 2007 called The Water Diviner's Tale.

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