Hugh Hefner will be in good company in his final resting place -- the cemetery where he'll be buried is filled with more celebs than the Holmby Hills 'hood where he lived in the Playboy Mansion.

Hef bought the crypt next to Marilyn Monroe years ago at the Westwood Memorial Park Cemetery -- but she's just the start. Merv Griffin, Farrah Fawcett, Florence Henderson and Rodney Dangerfield are also nearby. 

Farrah graced the cover of Playboy in 1978 and then again 1995, when she also posed naked inside. There's also at least one other famous playmate of the month and centerfold buried there, too.

HINT: She was Playboy's "Miss January 1955."

Over on Hollywood Boulevard, a less permanent memorial went up Thursday morning ... the Chamber of Commerce placed a wreath over Hef's star.