Atlantic Star was a cruise ship built in 1984. She sailed for Sitmar Cruises, Princess Cruises, P&O Cruises Australia, and Pullmantur Cruises. Under ownership of Royal Caribbean Cruises Ltd., the ship had been laid up since 2010 before being handed over to STX France in 2013 as a partial payment for the construction of what is now, Harmony of the Seas. She was later sold to a shipbreaker in Aliağa, Turkey, renamed Antic, and scrapped on 14 April 2013.

Sitmar Cruises and its predecessor Sitmar Line were company names derived from the acronym for the Società Italiana Trasporti Marittimi. SITMAR originally was an Italian shipping line founded by Russian émigré Alexandre Vlasov, however the company's headquarters were later transferred to Monaco. Vlasov initially operated cargo services from 1937, gradually replacing these with passenger services from 1947 until 1988, when SITMAR was sold to the Peninsular and Oriental Steam Navigation Company (P&O). After the sale, most of the former SITMAR ships were transferred to the fleet of P&O subsidiary Princess Cruises, while one, TSS Fairstar, became the sole vessel of the newly created P&O-Sitmar Cruises. The only ship originally ordered by SITMAR still sailing, is the MS Ambience for Ambassador Cruise Line.