Julio Urias' dad just made sure he'll NEVER forget his son's World Series win ... the star pitcher's pops just commemorated the Dodgers' title with a HUGE tat -- and it's awesome!
The artist who did the work -- Andres Ortega Rojas -- revealed the piece Sunday night ... showing off the new, incredible ink that runs from the top of Julio's dad's shoulder to just above his elbow.
The artwork features 24-year-old Julio celebrating inside the World Series trophy ... with "World Series Champions" inscribed at the bottom.