Marchers in New Delhi commemorate the death a year ago of a young woman after she was gang-raped aboard a moving bus last year on December 16th.
The trainee physiotherapist died in hospital in Singapore two weeks after the attack.
She's become a symbol of the dangers women face in a nation where a rape is reported on average every 21 minutes.
Some of those taking part in Sunday's vigil accuse the government of dragging its heels.
"I've come here from Mumbai, not only to fight but to help people who've woken up after the Nirbhaya case. I've come here to wake up the people still sleeping as our government is doing nothing, so we think we will have to go ahead and do something. I will surely do something until my last breath," a supporter named Chandni told Reuters.
The rape and the victim's death two weeks later unleashed a wave of sometimes violent protests across India.
Some commentators say the protests reflected the deep frustration of many urban Indians over what they see as a weak government and poor leadership on social issues.
Five men were arrested over the attack. One killed himself in jail, the other four are awaiting the outcome of an appeal against the death penalty each was given.
A teenager, tried separately as a juvenile, is serving a three-year term in detention.