The Waldorf Astoria New York is a luxury hotel and condominium residence in Midtown Manhattan in New York City. The structure, at 301 Park Avenue between 49th and 50th Streets, is a 47-story 625 ft (191 m) Art Deco landmark designed by architects Schultze and Weaver, which was completed in 1931. The building was the world's tallest hotel until 1963 when it was surpassed by Moscow's Hotel Ukraina. An icon of glamour and luxury, the Waldorf Astoria is one of the world's most prestigious and best-known hotels. Waldorf Astoria Hotels & Resorts was a division of Hilton Hotels, and a portfolio of high-end properties around the world operates under the name, including in New York City. Both the exterior and the interior of the Waldorf Astoria are designated by the New York City Landmarks Preservation Commission as official landmarks.

The original Waldorf-Astoria was built in two stages along Fifth Avenue and opened in 1893; it was demolished in 1929 to make way for the construction of the Empire State Building. Conrad Hilton acquired management rights to the hotel on October 12, 1949, and the Hilton Hotels Corporation finally bought the hotel outright in 1972. It underwent a $150 million renovation ($533 million in 2022 dollars ) by Lee Jablin in the 1980s and early 1990s. The Anbang Insurance Group of China purchased the Waldorf Astoria New York for US$1.95 billion in 2014, making it the most expensive hotel ever sold. The Waldorf was closed in 2017 for renovations; the upper stories were converted into 375 condominiums, while the lowest 18 floors will retain 375 hotel rooms. Dajia Insurance Group took over the Waldorf Astoria when Anbang went bankrupt in 2020, and, after several delays, the hotel is expected to reopen by 2024 at the earliest.

In 2009, the Waldorf Astoria and Towers had 1,416 rooms; the main hotel had 1,235 single and double rooms and 208 mini-suites, while the Waldorf Towers on the 28th to 42nd floors had 181 rooms, of which 115 were suites with one to four bedrooms. The most expensive room, the Presidential Suite, was designed with Georgian-style furniture to emulate that of the White House. The hotel has three main restaurants: Peacock Alley, The Bull, and Bear Steak House, and La Chine—a new Chinese restaurant that replaced Oscar's Brasserie in late 2015. Sir Harry's Bar, also located in the hotel, is named after British explorer Sir Harry Johnston.

The Waldorf Astoria has been known for its lavish dinner parties and galas, often at the center of political and business conferences and fundraising schemes involving the rich and famous. After World War II, it played a significant role in world politics and the Cold War, culminating in the controversial World Peace Conference of March 1949. The Presidential Suite was the residence of Herbert Hoover from his retirement for over 30 years, and Frank Sinatra kept a suite at the Waldorf from 1979 until 1988. Some of the luxury suites were named after celebrities who lived or stayed in them, including Cole Porter, the Duke and Duchess of Windsor, Douglas MacArthur, and Winston Churchill.