
It really depends on how long you've known each other, how close you are and so on.
If your feelings are strong and serious, I would suggest to spend a little more time with him. Suss out his body language and the way he looks at you, and if you feel there could be a chance, make sure the two of you are alone. Let him know you like him as more than a friend, and ask him what he thinks about it.
I know it can seem scary and difficult, but the best relationships start from friendship. At the same time, remember that if you dated and broke up, it's likely you'd lose your friendship, too. Are you willing to risk that?
What if he doesn't feel the same way?
Quite often, when you earn someone's trust and feel secure in your friendship, it is hard to see why that couldn't develop into a sexual relationship. However, the chemistry also has to be right for this element of a relationship to work.
If your friend doesn't feel the same way as you do, don't persist. If he's not interested in anything more than a platonic relationship, accept it - if not, you could lose his friendship entirely. If that does happen, just try to move on - and if it's painful at first, spend time with other friends for a while, just until your feelings have subsided a bit.