U.S. Curling Legend Matt Hamilton Cuts His Famous Hair For Charity

Matt Hamilton's famous locks are no more -- the U.S. curling legend just chopped them off ... but, don't worry, he got the cut for a VERY good cause!!

TMZ Sports has learned ... Hamilton -- who won a gold medal at the 2018 Winter Olympics -- hit up a Great Clips salon in Madison, Wisc. on Friday in order to cut his luscious hair and donate it to kids who have experienced hair loss due to medical issues.

It's a sizeable donation from Hamilton ... considering Matt's had the long hair for FOUR years. And, we're told as of chopping time, it had reached over a foot in length!!

Hamilton also got the cut to help raise awareness and money for brain cancer research.

As for how the good deed turned out aesthetically ... check out the before and after -- Hamilton sure looks good to us!