A roadside delivery waited for no man or woman — not even police officers.

That was the case when a police ambulance had to stop not long after midnight Thursday and let a baby boy enter the world, Nassau police said.

Police went to a Massapequa home on Shell Street after getting a 911 call about a woman, 26, having contractions.

She was nine months pregnant, and on the way to the hospital, the ambulance stopped because the baby was ready, police said.

Officers and a police medic helped deliver the child, police said.

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Then the baby’s entourage made their way to Good Samaritan Hospital Medical Center in West Islip, where both mother and child were admitted, police said.

Other details were not released; Nassau police plan to hold an 11 a.m. news conference on the newest county resident.