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Black is an actor, musician, comedian, songwriter and YouTuber, but across his diverse range of pursuits, his hirsute and unkempt image has remained a defining aspect of his identity in recent years.
As such, it is no surprise that people have been left a little stunned by his new clean shaven look - his headbanging locks now a thing of the past.
The 51-year-old took a pair of scissors to his mane last week and has since shared a video on YouTube in which he shaves it right down to the bone, intermittently strutting around in some trunks and bombing into a swimming pool.
Never before has so much of Jack Black's skin been on show. Indeed, we almost see the whole Jack, Black and sack.
Commenting on the video, entitled 'I'm a new man', one person said: "This is weird and unsettling. When the vid first started I legit thought I was looking at randy from trailer park boys."
Another said: "Definitely gonna tell my husband how this video killed my attraction to you."
A third added: "Therapist: Bald Jack Black Isn't Real He can't hurt you.
"Jack black: HAHA HAIR GO BOOP.
"I am scared of bald Jack Black."
But while lots of people were understandably taken aback by his transformation, many others think he now looks much younger.
One person said: "He de-aged like 15 years by shaving his whole head."
Another commented: "Honestly he looks younger and thinner without the hair."
A third said: "It's all over boys, why would a girl go out with you, when this masterpiece is walking around our planet."
Explaining why he decided to lop off all of his signature hair, Black said: "I know my hair was glorious and long, but it was also getting in the way. It was in my eyes, it was in my mouth.
"To top it all off, some people say a beard is a Covid-catcher and it's actually safer to be no beard, no hair."
But what do you think? You liking bald Black, or do we need hairy Black back?
All I know is, that's quite the mouthful.