Luka Doncic did his best Santa Claus impression Wednesday -- throwing a surprise party for pediatric patients in Dallas ... while doling out a bunch of gifts!!
The Mavericks superstar planned and funded the special day for kids at the Scottish Rite for Children medical facility ... and check out all the pics and vids -- the tots loved it!
While Luka couldn't be there in person -- he had a game against the Cavaliers to prepare for -- he made sure around 200 patients got NERF basketball hoops, NERF blasters, Jordan Brand apparel and some Chess-themed goodies.