Determining the "best" cruise for singles depends on whether you are looking for a high-energy party atmosphere or a more refined social setting with solo-specific amenities. Norwegian Cruise Line (NCL) is widely considered the pioneer in solo travel, being the first major line to offer "Studio" staterooms specifically designed for one person, which eliminates the dreaded "single supplement" fee. NCL also provides a dedicated Solo Lounge and hosted nightly meet-ups. For younger singles (20s and 30s) looking for a social, party-centric vibe, Virgin Voyages is an excellent adult-only choice that ditches traditional formal nights and buffets in favor of a "club" atmosphere and communal dining. If you are a solo traveler interested in luxury and making intellectual connections, Holland America Line offers a "Single Partners Program" with mixer events and even "gentleman hosts" on certain longer voyages. Ultimately, NCL remains the gold standard for logistical ease, while Virgin Voyages is the top pick for those who want a vibrant, non-traditional dating and social scene while sailing the open seas.