Pranava Prakash said five men barged into the gallery in the Noida district on Sunday, saying the pictures were “against Indian culture”.
He said he was thrown to the floor and a number of pictures were damaged.
Hardline Hindu groups have in the past protested over art works they say offend their beliefs.
The attack also comes in the wake of an intensified debate over artistic free speech, with controversial UK writer Sir Salman Rushdie abandoning plans to attend a literary festival in Jaipur amid security concerns.
Mr Prakash told Agence France-Presse news agency: “Five guys came in on Sunday and started yelling at me, saying, ‘Your paintings are against Indian culture, we cannot tolerate them’.
“They slapped me twice, threw me to the floor and then began pulling down the paintings, damaging three of my pictures.”
Mr Prakash said: “There is a certain section of people who think they alone are the custodians of Indian culture, and anyone who disagrees with them is the enemy.”