Foggy Nelson is a fictional character from Marvel Comics. He made his first appearance in Daredevil volume 1#1 (april 1964), and was created by Stan Lee and Bill Everet, the same creators of the Man without Fear.
Matt Murdock's best friend and work partner at Nelson and Murdock: Attorneys at Law. He's also one of the few people who know Murdock is the vigilante Daredevil.