No, The Ritz-Carlton is not part of Hyatt; it is a luxury brand within the Marriott International portfolio. The Ritz-Carlton became a wholly-owned subsidiary of Marriott in 1998 and is now a cornerstone of the "Marriott Bonvoy" loyalty program. Hyatt is a separate, independent, and competing hospitality company that operates its own luxury brands, such as Park Hyatt, Andaz, and the Alila collection. Because Ritz-Carlton is part of Marriott, guests can earn and redeem Marriott Bonvoy points for stays at Ritz-Carlton properties worldwide, but they cannot use Hyatt points or "World of Hyatt" benefits there. While both companies are giants in the luxury hotel space and offer similar high-end experiences, they are distinct corporate entities with entirely separate ownership, management, and loyalty structures.