The £16 festive glass and glitter decoration has the Prince of Wales with long hair at the back.
His locks are also glittery which accentuate his baldness.
The dangly tree dec has been branded an “abomination.”
There are also versions of Kate Middleton, King Charles and Queen Camilla for the yuletide season.
They also cost the same price and are on sale for the first time this Christmas.
Harry and Meghan have been excluded from the range.
Royal lover Audrey Davies said: “They did William so dirty.
“Why is his hair glittery?
“I’m glad I’m not famous and people don’t make me into merchandise.
Heather Nesser added: “Where would one find this abomination?
“Because I might need to have this for my friendsmas ornament swap.” [sic]
Another said: “Oh the back.”
A fourth added: “They got his messed up teeth right too.”
Samantha Owens exclaimed: “Oh my word.”
Erica Smith said: “This is supposed to be William?
“Try again.”
The Princess of Wales one is more flattering but doesn’t bear much resemblance.
Charles and Camilla have slightly closer likenesses, but they look very young.
The King’s is proving most popular and is already sold out.
But another royal fan said: “These are frightening.”
The decs are made by Cody Foster and Co based in Valentine, Nebraska, US.
They are all about 12cm (5inches).