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 MI-5 in the United States).

Having earned the respect of Adam and the rest of Section D, she is offered a job as a junior case officer on the grid and gladly accepts the role.

It is also hinted that she cares very deeply for her mother, who is ill.[2] As a junior case officer, Jo divided much of her time between grid based activities and field missions.

Throughout her tenure on the show, she took part in many important missions including serving as the bodyguard (albeit secretly at first) to the Prime Minister's university aged son in series five, when she successfully helped him elude capture by a reactionary group of anti-government activists.

The episode concludes with Special Forces storming the building, only to find Adam sitting silently as he cradles an apparently lifeless Jo in his lap.

Eventually, Jo regains her composure and becomes an indispensable member of the team once again, but is soon shocked by the murder of her colleague and former journalist/lover Ben Kaplan at the hands of double agent Connie James.

It quickly dawns on Jo that the only way to bring the situation to a close is an act of self-sacrifice, and she silently nods for a now armed Ros to take the shot; killing the terrorist, but sacrificing herself in the process.

Jo's name appears in a newspaper byline in series 3, episode 6 of the crime drama Hustle, a show devised by the same creators as Spooks.