Hundreds of people gathered outside the Oxford Union to protest against a talk by the gender-critical academic, Kathleen Stock.
Prof Stock had said she was "very determined" for the talk to go ahead, despite some students responding angrily to her invitation to the event.
Some say her views on gender identity are transphobic.
The protest came after Prime Minister Rishi Sunak said the talk by Prof Stock should be allowed to go ahead.
"Agree or disagree with her, Professor Stock is an important figure in this argument. Students should be allowed to hear and debate her views," he said.
"University should be an environment where debate is supported, not stifled.
"We mustn't allow a small but vocal few to shut down discussion."
Prof Stock left her job with the University of Sussex in 2021 after protests against her from students following the publication of a book where she questioned the idea that gender identity is more socially significant than biological sex.
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