"I Wonder Why" is a doo-wop song, written by Melvin Anderson with lyrics by Ricardo Weeks.
The song was first recorded by Dion and the Belmonts.
It is sung from the point of view of a man telling his girlfriend that he loves her but does not know why.
The song is noted for Carlo Mastrangelo bass part.
"I Wonder Why" was released as Laurie Records' first single, (number 3013), and was the group's first national pop chart hit, in 1958.