A good Samaritan found a Queens boy after he disappeared from his Ozone Park home early today, police said.

Zackary Nazario, 5, went missing after his 23-year-old brother, who had been watching him, left their Ozone Park residence on Rockaway Boulevard, near 118th Street, about 12:45 a.m., cops said.

When he came back, the child was gone, cops added.

The boy was wearing cartoon-style underwear and carrying a red blanket or towel, police said. He didn’t have a shirt on, police added.

A passerby found Nazario near the Van Wyck Expressway and Rockaway Parkway at 8:35 a.m., and called cops.

Police had used a helicopter overnight to search for the missing child, authorities said.

Cops said the child was found in good physical and mental condition.