The company has secured long-term management agreements with the Galaxy Entertainment Group (GEG) for more than 1,300 bedrooms, suites and floating villas at the properties.
Both of the hotels will anchor the second phase of Galaxy Macau, which already boasts three world-class hotels and more than 55 restaurants, cafes and bars in the first phase.
A spokesperson has revealed that both properties are expected to include spas, with the Ritz-Carlton one to be more spectacular – however, further details are yet to be confirmed.
The 250-bedroom Ritz-Carlton, Macau will also comprise a rooftop pool with whirlpool and eight private cabanas, as well as an all-private-dining Chinese restaurant and the Ritz Bar.
Meanwhile, nearly 1,100 bedrooms and suites will comprise the JW Marriott Hotel Macau, with facilities to include a signature Chinese restaurant and a tranquil pool.
Marriott International, Asia president and managing director Simon Cooper said: China is our second largest market outside North America and opening two of our premier brands on the same site in such a fast growing market is a major commitment.
GEG chair Dr Che-woo Lui added: To complement Phase One exceptional hotel offering we are extremely pleased to be introducing Marriott International globally recognised luxury hotel brands.
Both properties are scheduled to open in 2015.