Three city Department of Correction officials have been forced to resign for allowing a bar mitzvah bash for a Tombs inmate’s son last December — but each will still be able to draw a pension, The Post has learned.

The shakeup comes five months after The Post exposed the behind-bars reception for fraudster Tuvia Stern’s 16-year-old.

Chief of Department Carolyn Thomas — who had recently applied for the commissioner’s job — was given her marching orders, along with Chief Frank Squillante and Warden George Okada, by new Commissioner Dora Schriro, according to multiple department sources.

Okada, the department’s first Asian-American warden, had been especially considered a rising star.