I've never seen an official complete list, though one would be helpful.
Here's a quick copy/paste I found on several different forums.
Some entries were contradicted. For those I went with the challenger.
Aaron Spelling - Mixture#79
Albert Einstein smoked Revelation.
Alfred Hitchcock smoked Dunhill blends.
Basil Rathbone smoked what is now known as Pipeworks & Wilke's #515.
Benny Hill liked Gondor.
Bing Crosby smoked various blends, but we know he smoked Hayward Mixture, as seen in a photo on a book about him.
Carl Jung smoked Granger.
Charles Dickens loved his Syrian Latakia.
Charles Nelson Reilly smoked Mick McQuaid Ready Rubbed and Three Star Blue.
Chesty Puller smoked Prince Albert according to the author of his biography.
Clement Attlee - Will's Cut Golden Bar
Edward G. Robinson smoked a variety of blends, including the one named after him and Dunhill blends.
Fred MacMurray supposedly enjoyed Kramers Father Dempsey
Gen. MacArthur smoked Harkness D and F, the House of Windsor blends, and "whatever was available at the PX."
Gerald Ford was reported to have smoked Field & Stream and Walnut. A resent book says Ford's tobacco of choice was Edgeworth Ready Rubbed.
Groucho Marx lent his name to ERR ads, but his son said Groucho smoked a Dunhill blend.
Hugh Hefner is known for smoking Mixture #79, but his right hand man (who had started working for Hefner in 1960) told me in 2003 that Hefner preferred Sail Yellow, and smoked mainly for show.
J M Barrie - Craven A ("the Arcadia"), later, John Cottons 1&2
Robert Oppenheimer Middleton's Walnut.
Shelby Foote smoked Edward G. Robinson's Pipe Bend for a while, until he decided to cut it by adding a third of various OTCs to it. However, the last blend he was known to smoke was two parts EGR and one part Barking Dog.
Stalin smoked Edgeworth Ready Rubbed.
Tony Benn - St. Bruno
Walter Cronkite enjoyed Wilke No. 72, Sail Green and various Dunhill English blends.
William Conrad smoked a lot of Dunhill blends, but apparently settled on Amphora Full Aroma.