The 49-year-old actress, who plays lawyer Miranda in the show and movie spin-offs, said she was really proud of the series, reported Digital Spy.
"I'd absolutely do another Sex and the City movie - if Michael Patrick King wanted to write it and Sarah Jessica Parker wanted to do it. I'm very proud of it," Nixon said.
Nixon appeared alongside Parker, Kim Cattrall and Kristin Davis on the HBO series from 1998 until 2004.