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.

Spooks is a British television spy drama series that originally aired on BBC One from 13 May 2002 to 23 October 2011, consisting of 10 series. The title is a colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid. In the United States, the show is broadcast under the title MI-5. In Canada, the programme originally aired as MI-5, but later aired on BBC Canada as Spooks.