Julien's Auction House plans to sell about 2,000 items belonging to the singer at an event in California later this month.
Jackson's production company had filed a lawsuit seeking the return of some of the objects taken from his Neverland ranch. However, auctioneer Darren Julien claimed that he had signed an agreement covering the sale last year with Dr Tohme Tohme of Jackson's production company.
Julien's attorney Jerry Hawxhurst said that Los Angeles Superior Court Judge Brett Klein's ruling in favour of his client had put the matter to rest, reports Reuters.
A rhinestone-covered equestrian cap, imperial-style military jackets, awards, statues, toys, furniture and a piece of scribble art created by child actor Macaulay Culkin in 1991 are among items in the auction, which is expected to make more than £6 million.