How do you get rid of a guy who fancies you but you're not interested in?

Answer 1

Pay as little attention to him as possible would be the first step. Another good move would be purposely show interest in someone else in front of him. This would give him an indication that you are not only not interested in him and his poor actions of trying to get your attention, but you have interests in someone that is not even trying. Males would always assume (or like to assume) that the female is sending mixed signals so be sure that your signal has no mixed body or face expressions.

Answer 2

Simply tell him a polite but clear "I'm sorry but I'm not interested." If he keeps bugging you, don't be afraid to get less polite.