Authorities have uncovered a massive narcotics mill in the Bronx — and seized $7.5 million in heroin and fentanyl, including some labeled “Death” and “Kill.”

Investigators found the haul during a court-authorized search of the illicit packaging plant in the Soundview neighborhood, according to a statement from the city’s Office of the Special Narcotics Prosecutor.

Inside the two-bedroom apartment at 1240 Morrison Ave., officials recovered 11 kilos of suspected heroin inside a duffel bag and another 10 kilos hidden in a wall behind a medicine cabinet, the statement said.

Equipment used to package the narcotics for street-level sale was found in a second bedroom — including nearly 16 tape dispensers, 300 rolls of tape, three scales, four strainers and 12 electric coffee grinders, according to Special Narcotics Prosecutor Bridget Brennan.

There were also three cases of glassine envelopes and more than 100 ink stamps used to brand them, officials said.

“Dexter,” “Super High,” “Kill Ducati” and “Heartless” were among the stamp names.

Agents nabbed five men in the bust — Matias Rosario-Ramon, 37, Anthony Polanco, 29, Willy De La Cruz, 28, Pedro Sandoval, 26, and Luis Guzman-Rojas, 46 — who were awaiting arraignment Thursday in Manhattan Criminal Court. They face charges of criminal possession of a controlled substance.

Officials recovered a total of over 55 kilos in street drugs, which was part of an ongoing investigation into a narcotics trafficking operation, authorities said.