A Catholic-school teacher claims she was singled out for being single.

Andrea Puma, 34, says the principal of Our Lady of the Snows in Floral Park, Queens, demanded that parents and teachers “never” communicate outside of school, then fired her after he found out she’d gone on a few dates with the father of a former student.

But Puma’s suit in Brooklyn Supreme Court alleges that Principal Joseph Venticinque had a double standard: He didn’t discipline a married colleague who invited both staffers and parents to a Super Bowl party, she claims. She’s suing the school and the Diocese of Brooklyn and Queens for unspecified damages.

The diocese slammed the allegations as false and said Puma’s “affair” with the married dad of a student was “inappropriate behavior” that violated the school’s code of conduct.