Top 10 Biggest Hotels in the World

10. Excalibur Hotel and Casino, Las Vegas
The Excalibur Hotel and Casino is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada, in the United States. It is owned and operated by MGM Resorts International.
9. The Venetian Las Vegas, Las Vegas
The Venetian Resort Hotel Casino is a luxury hotel and casino resort situated between Harrah's and The Palazzo on the east side of the Las Vegas Strip in Paradise, Nevada, United States, on the site of the old Sands Hotel. Designed by KlingStubbins, the hotel tower contains 36 stories and rises 475 feet (145 m). The Venetian is owned and operated by the Las Vegas Sands Corporation. The Venetian also serves as the seat of the corporate headquarters for its parent company.
8. Ambassador City Jomtien, Pattaya
The Ambassador City Jomtien is a large resort at Jomtien Bay, near Pattaya, Thailand, with "over 4,210 rooms". Located about 8 km south of Pattaya, it occupies a 40-acre (160,000 m2) campus overlooking the beach and nearby mountains.
Image Source: http://megatour.by/tour/tailand/393-ambassador-city-jomtien-ocean-wing-4.html
7. THEhotel + Mandalay Bay + Four Seasons, Las Vegas
Thehotel at Mandalay Bay is a 42-story 1,117 room luxury suite hotel owned and operated by MGM Resorts International. It is located in Paradise, Nevada on the Las Vegas Strip within the Mandalay Bay complex.
Mandalay Bay Resort and Casino is a 43-story luxury hotel and casino on the Las Vegas Strip in Paradise, Nevada, owned and operated by MGM Resorts International.
The Four Seasons, originally referring to the traditional seasons of spring, summer, autumn and winter
6. Luxor Las Vegas
Luxor Las Vegas is a hotel and casino on the Las Vegas Strip in Paradise, Nevada. The 30-story hotel, owned and operated by MGM Resorts International, has a 120,000-square-foot (11,000 m2) casino with over 2,000 slot machines and 87 table games.
5. Wynn Las Vegas + Encore Las Vegas
Wynn Las Vegas, often referred to as simply the Wynn, is a luxury resort and casino located on the Las Vegas Strip in Paradise, Nevada. The US$2.7 billion resort is named after casino developer Steve Wynn and is the flagship property of Wynn Resorts Limited.
Encore Las Vegas or Encore at Wynn Las Vegas (often just called Encore) is a luxury resort, casino and hotel located on the Las Vegas Strip in Paradise, Nevada.
4. Disney's All-Star Resort, Orlando
The Walt Disney World Resort, informally known as Walt Disney World or simply Disney World, is an entertainment complex in Lake Buena Vista, Florida. The resort opened on October 1, 1971 and is the most visited vacation resort in the world, with an attendance of 52.5 million annually.
Image Source: http://www.holidayapartments.co.uk/hotels/usa/acc1/florida/orlando/disney/disney-all-star-movie1-pr1.html
3. First World Hotel, Genting Highlands (Malaysia)
First World Hotel is a three-star hotel with a total of 6,118-rooms, making it the fourth-largest hotel in the world by number of rooms. It was the largest hotel in the world until The Palazzo, an expansion of The Venetian in Las Vegas, officially opened on 1 January 2008 at 00:00 MST.
2. MGM Grand Las Vegas, Las Vegas
The MGM Grand Las Vegas is a hotel casino located on the Las Vegas Strip in Paradise, Nevada. The MGM Grand is the second largest hotel in the world by number of rooms and the largest hotel resort complex in the United States, ahead of The Venetian.[1] When it opened in 1993, the MGM Grand was the largest hotel in the world.
1. Izmailovo Hotel, Moscow
The Izmailovo Hotel is a group of hotels located near Izmailovo village in the Izmaylovo District of Moscow, Russia. The property consists of four buildings containing a total of 7,000 to 7,500 rooms, making it the world's largest hotel by number of units.
Source: http://en.wikipedia.org/wiki/List_of_largest_hotels_in_the_world