The survey, conducted by the wealth intelligence company, New World Wealth, has ranked the hotels on the basis of votes by the multi-millionaires over the past 12 months.
It said the "sample included wealthy individuals from all over the world, but did not disclose the sample size.
Also Read
Top-ranked Plaza is one of the three prized overseas hotel assets owned by Sahara group. These three hotels (the other two being Dream Downtown in New York and Grosvenor House in London) have attracted several suitors in the recent past.
The Bellagio in Las Vegas was second and was followed by London's Mandarin Oriental, Hotel du Cap-Eden-Roc in Antibes (France) and La Mamounia in Marrakech (Morocco) in top-five.
Others in the top-ten included Little Nel in Aspen (US) at six place, Singapore's Raffles (7th), Ritz Paris (8th), Villa d'Este in Lake Como, Italy (9th) and Dubai's Burj Al Arab (10th).
Interestingly, the report said that most of these hotels are relatively small and only the Plaza, Mandarin Oriental, Burj Al Arab and Bellagio have more than 150 rooms.
The Mandarin Oriental was rated top hotel in the UK and Europe, La Mamounia in Africa and Raffles in Asia.