"Around 12.20 pm Tharoor was going to attend the International Women's Day function at Talkatora stadium in central Delhi when his car was stopped by some women BJP Mahila Morcha activists," said a police officer.
The activists surrounded the car and shouted slogans. Policemen deployed near the stadium intervened and controlled the situation.
The protest continued for around 15 minutes, police said.
Delhi Chief Minister Sheila Dikshit was the chief guest at the International Women's Day function in the stadium.
Police said they did not have any prior information that Tharoor was to visit the stadium.