Heres a few I remember reading when I was fifteen:
A Walk Acroos America- Peter Jenkins
Clockwork Orange- Anthony Burgess
A Wrinkle in Time- Madeleine Lengle
Fahrenheit 451- Ray Bradbury
I think the easiest way to get a 15 year old male to enjoy reading would be leaving a copy of Fight Club laying around. I wasnt 17 till I got my hands on that but, it is literally perfect for teenage boys...... mothers be damned.