Kyle Kuzma will now certainly never forget his Univ. of Utah roots ... 'cause he just got a mountain range back tat to pay homage to his alma mater -- and it is MASSIVE!!!

TMZ Sports has learned ... the Washington Wizards new star wanted to get ink to represent his 2014 to 2017 days as a Ute, so he hit up celeb tat artist Herchell L. Carrasco.

We're told the 26-year-old headed out to Carrasco's Pachuco Tattoo shop in Orange, Calif. ... and sat like a rock for the huge scenery piece.

Carrasco said it all took about six hours ... with the mountain range scene ultimately ending up covering 1/3 of Kuzma's upper back.