Who knew pizza could be this addicting?

German cops raided a pizzeria after learning its most popular pizza was served up with a side of cocaine.

Suspicious food inspectors first alerted cops to the unidentified pizza joint in Düsseldorf after noting the buzz drawing lines for its special item number 40 on the menu.

“That was one of the best-selling pizzas,” criminal director Michael Graf von Moltke told reporters, without revealing how much the coke-on-the-side special cost.

Food inspectors first flagged the suspicious order in March, and when cops went to confront the pizzeria’s 36-year-old manager, he threw a bag of drugs out of his apartment window, which “fell right into the arms of the police officers,” police said.

The stash contained 3.5 pounds of cocaine, 14.1 ounces of cannabis and $290,378 in cash, police said.

The pizzeria manager was released several days later — just to reopen his slice shop and started selling the number 40 with a side order of cocaine again, cops said.

Investigators then looked at the supply chain — and ultimately busted an entire drug ring in western Germany, arresting three suspects including the operation’s alleged 22-year-old mastermind.

Authorities also raided the homes and businesses of 12 suspects and uncovered two cannabis plantations with more than 350 plants.

Their investigation also found knives and other weapons, as well as cash and expensive watches.

The pizzeria manager tried to flee the country, but was arrested and remains in custody.

He and the other suspects — as well as the pizzeria — were not identified due to Germany’s strict privacy rules.

With Post wires.