Health inspectors have shuttered a beloved century-old German bakery in New York City after spotting a “severe vermin infestation” during a surprise visit Friday.

Glaser’s Bake Shop, which previously boasted an “A” rating, will not reopen at First Avenue and East 87th Street until after the holidays, angry owners told The Post.

“This is our busiest time of the year, and our food is going to waste!” fumed Tom Glaser, who runs the shop. He claimed that city bureaucrats are bilking him out of would-be holiday profits simply because a neighbor with a grudge filed an anonymous complaint.

But a spokeswoman for the city’s Department of Health said workers racked up several other violations, including failing to wear gloves and hairnets while handling food.

The abrupt closing irked regulars, some of whom placed pastry orders for holiday cakes long ago and now won’t be able to enjoy their treats.