Rosebud’s sliding onto the auction block.

The childhood sled that prompted the most iconic word uttered in the legendary film “Citizen Kane” goes up for auction next month — along with more cherished movie set props.

The Tinseltown treasures include Kevin McCallister’s knit cap from “Home Alone,” a lightsaber brandished in “Star Wars: Revenge of the Sith” and a whip wielded in “Indiana Jones and the Last Crusade,” according to Heritage Auctions. 

“These aren’t just props. They’re mythic objects,” said Joe Maddalena, the firm’s vice president. “They tell the story of Hollywood’s greatest moments, one piece at a time.”

The groovy blue velvet suit worn by Mike Myers’ Austin Powers in the 2002 screwball comedy sequel “Goldmember” is also among the haul, which hits the auction block July 15-19.

It also includes Luke Skywalker’s X-Wing from “Star Wars: The Empire Strikes Back” and original art for “Apocalypse Now.”

But the biggest score for some movie buffs may be the sled featured in “Citizen Kane,” which is widely considered the greatest movie of all time. 

In Orson Welles’ groundbreaking 1941 film, media mogul Charles Foster Kane mysteriously utters the word “Rosebud” on his deathbed, setting off the story’s central question. 

Viewers later learn “Rosebud” is the name of his beloved childhood sled — and a symbol of the powerful character’s lost innocence.

The long-lost sled that’s up for auction is one of three of the props known to have survived, the auction firm said.

It’s currently owned by  “Gremlins” director Joe Dante, who found it while filming on the former RKO Pictures lot in 1984.

The sled’s estimated value wasn’t immediately clear — but one of the three props was sold to director Steven Spielberg for $60,500 at a Sotheby’s auction in 1982, The New York Times reported that year.

Meanwhile, the whip — cracked by Harrison Ford playing the titular character in “Indiana Jones” — was given to Prince Charles by the actor at the 1989 premiere of “The Last Crusade” in the UK.

Also for sale is the retro Citroën 2CV car driven by Roger Moore playing James Bond in “For Your Eyes Only,” along with artifacts from the collection of famed director Cecil B. DeMille.

With Post wires