Jack Osbourne is coming after “pathetic” Pink Floyd’s Roger Waters after the musician dissed his late father, Ozzy Osbourne.

Check out his expletive-filled social media post from Tuesday night — JO goes on a no-bars-held attack on Roger, calling him an “out of touch” attention seeker.

He adds … “My father always thought you were a c**t- thanks for proving him right.”

Jack’s rage-filled diss comes after Roger pissed on Ozzy’s grave on “The Independent Ink” last month by saying he was never impressed by Black Sabbath or Ozzy’s “idiocy and nonsense.”

TMZ has reached out to Roger’s rep for comment.

As you know, Ozzy died on July 22 following a lengthy battle with Parkinson’s disease.

He was mourned by millions around the world and then laid to rest at his private family estate in Buckinghamshire, England.