Weisz went to Trinity Hall, Cambridge, where she read English. She graduated with upper second-class honours. During her university years she was a contemporary of Sacha Baron Cohen, Alexander Armstrong, Emily Maitlis, Sue Perkins, Mel Giedroyc, Richard Osman, and Ben Miller (whom she briefly dated), and appeared in various student dramatic productions, co-founding a student drama group called Cambridge Talking Tongues. The group won a "Guardian" Student Drama Award at the 1991 Edinburgh Festival Fringe for an improvised piece called "Slight Possession", directed by David Farr.