Holding placards that read: "Break the Silence", "No Place for Islamophobia" and "Shed Hate not Blood" among others, the protesters said they had gathered to send out a message that there is a need to unite for a cause.
At the Jantar Mantar in the national capital, among those who took part were family members of 17-year-old Junaid, who was stabbed to death on June 22 onboard a train, which he had taken with his two brothers after Eid shopping in Delhi.
Last night, over a 100-strong mob attacked a Muslim man on the suspicion that he had slaughtered a cow after finding the carcass of a bovine near his house in Giridih district of Jharkhand.
The "Not In My Name" campaign began after a Facebook post by filmmaker Saba Dewan against the stabbing of Junaid. He sought to "reclaim the Constitution" and "resist the onslaught" on the right to life and equality.
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In Mumbai, people braved rains to come out in large numbers. Actors Shabana Azmi, Konkona Sena Sharma, Rajat Kapoor and Ranvir Shorey and social media activist Arpita Chatterjee were among those who participated in the protest held at Carter Road in suburban Bandra.
In Kolkata, among the protesters was filmmaker Aparna Sen. She said she was protesting against something which "we do not support and that is attacking any religious community".
She stressed that liberal voice has to be heard.
Protests were also held in cities like Allahabad, Bengaluru, Chandigarh, Jaipur, Kochi, Lucknow, Patna and Thiruvananthapuram.