Here are well-known five‑star New York City hotels that feature full-service luxury spa & wellness centers (spa name — short highlights). I’ve cited each hotel’s official spa/wellness page.

• The Peninsula New York (Midtown / Fifth Avenue) — The Peninsula Spa & Wellness Center: multiple treatment rooms, men’s/women’s heat experiences, glass‑enclosed pool and fitness center; popular for Biologique Recherche facials and signature deep‑tissue treatments. (peninsula.com)

• Mandarin Oriental, New York (Columbus Circle / Midtown) — The Spa at Mandarin Oriental: Forbes Five‑Star spa with amethyst steam room, vitality pool, VIP suite with skyline views, and holistic treatments. (mandarinoriental.com)

• Four Seasons Hotel New York Downtown (Financial District/Tribeca border) — Four Seasons Spa & Health & Wellness floor: seven‑room spa, 75‑ft lap pool, infrared sauna, movement studio and curated medispa-style facials and bodywork. (fourseasons.com)

• Park Hyatt New York (Midtown / near Carnegie Hall) — Spa Nalai: renovated luxury spa with indoor hydrotherapy (saltwater lap pool, whirlpool), eucalyptus steam, treatment suites (some with Central Park views) and a full fitness center. (welldefined.com)

• The Ritz‑Carlton New York, Central Park (Midtown / Central Park South) — La Prairie Spa at The Ritz‑Carlton: dedicated La Prairie treatments, separate lounges, steam/sauna and movement/yoga offerings. (ritzcarlton.com)

• The Plaza, A Fairmont Managed Hotel (Fifth Avenue / Midtown) — Guerlain Spa at The Plaza: Guerlain‑branded luxury spa on the 4th floor offering facial/body treatments and a fitness center. (guerlainspas.com)

• Baccarat Hotel & Residences (Midtown / near MoMA) — Spa de La Mer: La Mer’s first dedicated U.S. hotel spa, intimate treatment rooms and pool/jacuzzi access with La Mer signature facials. (baccarathotels.com)

• The Greenwich Hotel (Tribeca) — Shibui Spa: Japanese‑inspired onsen feel (lantern‑lit pool, bathing rituals), five treatment rooms, steam & rain showers and bespoke natural/plant‑based treatments. (thegreenwichhotel.com)

• The Surrey, a Corinthia Hotel (Upper East Side) — The Surrey Spa (partnered with Sisley Paris): intimate treatment rooms, steam/sauna, salt/tepidarium relaxation room and curated Sisley facials/body therapies. (corinthia.com)

• The Chatwal, New York (Theater District / Midtown West) — Naturopathica Spa & Healing Center: boutique hotel spa with treatment rooms, indoor current pool, steam facilities and holistic/natural treatments. (thechatwalny.com)

• The Langham, New York, Fifth Avenue (Fifth Avenue / Midtown) — Langham wellness/Chuan‑inspired offerings: full fitness center and hotel spa facilities (Chuan/holistic treatments historically offered through the brand’s wellness program). (langhamhotels.com)

Quick tips

• Most hotel spas require advance reservations and may restrict facility access to guests who book treatments that day — book ahead, especially on weekends and holidays. (Check each hotel’s spa page for current hours/reservation policies.) (peninsula.com)

If you’d like, I can:

• Narrow this to a short list by neighborhood (Midtown, Upper East Side, Tribeca, Downtown), or
• Show sample treatment menus and current prices for any 2–3 spas you’re considering.