It happened in the 4600 block of Red Bluff Road around 1:45 a.m.
The boy was riding in the northbound lanes of Red Bluff near Kingsdale when he was hit, according to police.
He was flown to a hospital where he later died.
Investigators were looking through surveillance video from the area to try and get a description of the vehicle involved. People who were nearby when the crash happened told officers they saw two cars around the same time it happened, but they weren't sure if either vehicle was involved.
The victim's identity wasn't immediately released.
If you have any information about the vehicle involved in this crash, call the Pasadena Police Department at 713-477-1221.