Miranda Caroline Raison is a British and French actress. She is best known for playing Jo Portman in five seasons of Spooks (MI5) and Nellie Davenport in HBO's Warrior. She originated the title role in Howard Brenton's Anne Boleyn at Shakespeare's Globe Theatre and played Hermione in Kenneth Branagh's production of The Winter's Tale, both to critical acclaim. She is also a prolific voice artist.

Joanna Portman (1979–2010) was a fictional Field Operative in the Counter-Terrorism department at MI5, featured in the British television series, Spooks, also known as MI5 in the United States. She was played by Miranda Raison. A former aspiring journalist, she joined the team in the fifth episode of series 4 after being recruited by Adam Carter; Jo retained her journalist occupation as her MI5 cover. She was killed in a volatile hostage situation in the third episode of the eighth series.