There has been an Alistair Maclean novel series about UNACO, United Nations Anti-Crime Organization. Okay, not intelligence, strictly speaking, but their activities were a mixture of crime-fighting and counter-espionage, ranging from rescuing the US President from a sabotaged Air Force One to stopping an ex-KGB general from carrying out some <insert adjective here (choices are: diabolical, fiendish, and doomsday)> plan. The novels were adapted from some screenplays Maclean had written. At least one movie was made, and IIRC, it starred Pierce Brosnan in the lead role.
There's also a movie series called Art of War about an intelligence agent of the UN. It starred Wesley Snipes in the first two installments.