Sonia Dridi, a correspondent for France 24, said a mob of mostly young men surrounded her on Friday while she was on the air and then began to grope her.
The attack lasted several minutes before a male friend managed to pull her out.
"I was groped everywhere. I realised (later), when someone closed my shirt, that it was opened, but not torn off. I avoided the worst because I have a good belt," she said.
Dridi said she was filing a police complaint. In the past, police have not succeeded in apprehending suspects after similar attacks on women in the protest hub.
In June, a group of men attacked and sexually assaulted several protesters in a women's march against sexual harassment in Tahrir – the epicentre of the uprising that toppled president Hosni Mubarak early last year.
The assaults, which female protesters and journalists say are commonplace in Tahrir Square, had already gained notoriety after US journalist Lara Logan was sexually assaulted there on February 11 2011, the day Mubarak resigned. – Sapa-AFP.