Ex-Tinder Chief Executive Greg Blatt is punching back at two former execs at the hookup app who accused him of sexual harassment and sexual assault at a 2016 Christmas party.

On Thursday, Blatt filed a defamation suit against his accuser, Rosette Pambakian, and against Tinder’s co-founder and former CEO Sean Rad, alleging that the sexual-battery accusations were part of a smear campaign.

“This is a new low for IAC/Match and their former CEO. They continue to retaliate against and smear a victim of sexual assault and the person who reported it,” Orin Snyder, Rad’s attorney at firm Gibson Dunn, told The Post in a statement.

“Their attacks are based on lies and documents that are taken out of context. When all of the evidence comes to light, it will be obvious what happened here. It’s shameful that these public companies are continuing to cover-up the truth.”