Prince William has such a fierce temper that he allegedly even “terrifies” dad King Charles.

“William is capable of great bellowing tantrums,” author Christopher Andersen told Page Six in a recent interview.

In his new book, “Kate! The Courage, Grace, and Power of the Woman Who Will be Queen,” Andersen notes that while the Prince is “kind and considerate to a fault” with staff and strangers, and never raises his voice to his wife or children, he does raise his voice at his father.

“When he gets frustrated, he does resort to shouting” at the King, a former Highgrove staffer said, who allegedly witnessed several shouting matches.

“William has a huge, booming voice,” the staffer continued. “Much louder than his father’s so it’s not something you soon forget.”

At least one other member of the royal family has been on the receiving end of William’s temper — his brother, Prince Harry.

In his memoir, “Spare,” Harry recalled that he and his brother got into a heated argument over Harry’s wife, Meghan Markle.

Harry claimed that William, who was “piping hot,” lunged at his younger brother, grabbing him by the collar and knocking him to the floor, causing him to land on a dog’s bowl, “which cracked under my back, the pieces cutting into me.”

Andersen also told us that it’s no surprise William can be fiery, as King Charles “has a Vesuvius temper.”

In a previous book about the monarch, Andersen wrote that Charles tore a “sink off the wall” in frustration after losing a cufflink down the drain.

Charles’ temper was on display in the days following the Queen’s death in 2022, when he threw a hissy fit over a leaky pen.

“Can’t bear this bloody thing,” he seethed while furiously wiping away black ink with a handkerchief. “Every stinking time.”

A Palace spokesperson did not respond to requests for comment.