MS Viking Grace is a cruiseferry constructed at STX Europe Turku Shipyard, Finland for the Finland-based ferry company Viking Line. The ship was delivered to her owners on 10 January 2013, and entered service on 13 January 2013. She is the first large-scale passenger ferry to be powered by liquefied natural gas (LNG) as well as being fitted with a rotor sail.

Viking Grace replaced MS Isabella (now known as MS Isabelle) on the Turku-Långnäs-Stockholm route.Enkvist, Liisa: Ensimmäinen laiva korvaa Isabellan. Turun Sanomat, 26 October 2010, 106th year, p. 12. Turku: TS-Yhtymä Oy. Viking Grace is twinned by MS Viking Glory, which entered service in March 2022.

Viking Line and STX Finland made a contract of building the ship (shipyard project number NB 1376)Viking Linen vuosikertomus 2009–2010 (PDF), Viking Line. Accessed on 4 August 2015. on 25 October 2010, and the contract went into force on 22 December 2010. The contract price was about 240 million euro, and the ship was delivered in January 2013. The contract included an option of an additional ship.Backman, Mikael: Viking Line tilaa uuden laivan, press announcement 22 December 2010. Mariehamn: Viking Line. Accessed on 23 December 2010.Viking Line tilaa uuden laivan Suomen ja Ruotsin välille, Helsingin Sanomat 25 October 2010. Accessed on 30 October 2010. Constructing the ship took 2600 man-years.

Viking Grace has a length of , beam of and maximum summer draft of . The ship has a deadweight tonnage of 6,107 DWT and a gross tonnage of 57,565 GT, which gives maximum passenger capacity for 2,800 people. The vessel has 880 rooms, restaurants, bars, spa and shopping centers. MS Viking Grace also has 1,000 lane meters space for cars and 1,275 lane meters for storage of ro-ro cargo.

Decks

Deck 13 Helicopter deck. Deck 12 Sun deck,Blueprint of M/S Viking Grace . Accessed on 26 September 2015. outside deck bar open from May to August.Viking Grace – Kesäkannet. Accessed on 6 August 2015.

Deck 11 Oscar à la carte, Seamore Champagne Lounge, Wine Shop, Frank's Casual Dining, gaming room, children's play room, Spa Wellness and Club Vogue (upper level).

Deck 10 Buffet Aurora, Arcade, Sweet & Salty Café, Retro Bar & Dancing, Rockmore Bar, gaming room, children's play room, casino, sun deck and Club Vogue (lower level). Deck 9 Shopping World duty free shop, Teens, gaming room, information desk, conference rooms, Victoria's Secret, bridge, café, cabins of classes PRM, ID2, SH3 and IP2. Deck 8 Cabins of classes SU1, SU2, PRM, SD2, ID2, S4, I4, I2, IH4 and IP2. Deck 7 Cabins of classes SU3, SU4, PRM, SD2, ID3, S4, I4, I2, IH4, S4R and I4R, embarkation and disembarkation. Deck 6 Cabins of classes SD2, ID2, S4, I4, IH4, DH4, SH4, SF6 and IF6, embarkation and disembarkation. Deck 5 Cabins of classes S4, I4, IP2 and Driver, car deck. Deck 4 Car deck (for personal cars only, deck can be lifted up). Deck 3 Car deck (for all cars). Deck 2 Machinery room and crew quarters. Deck 1 Machinery room and crew quarters.

Cabins

With Viking Grace, Viking Line changed the class designations of the cabins from letter and number combinations to more descriptive names. The names have also since been changed on other Viking Line ships. All cabins have a toilet, a shower and a TV. Cabins for the disabled and suites have a doorway width of 89 cm, other cabins 64 cm.M/S Viking Grace – hytit, Viking Line. Accessed on 4 August 2015.M/S Viking Grace guide, pp. 16–18.

Suite (SU1, SU2, SU3, SU4) Four different suites with a double bed and a sofa bed with special breakfast for four people. Also a fridge with refreshments. Some suites also have a hot tub. Floor surface 41 to 45 m2. Premium (PRM) A more classy cabin with a large window for four people with a double bed and a Sofa bed. A fridge with refreshments and a special breakfast are included in the price. Floor surface 13.8 m2. Seaside Double (SD2) A spacious cabin with a window, for two people. A double bed. Floor surface 9.7 m2. Seaside Four (S4) A cabin with a window, for four people. Two bunk beds with two levels each. Floor surface 9.4 to 9.7 m2. Seaside Four R (S4R) A cabin with a window without a full-scale floor mat. Two bunk beds with two levels each. Floor surface 9.4 m2. Seaside Family (SF6) A combination of two separate cabins for a maximum of six people (at least one adult and two children). An interior door. One cabin has a double bed and the other has two bunk beds with two levels each. Floor surface 19.4 m2. Inside Double (ID2) A cabin without a window, for two people. A double bed. Floor surface 9.4 to 9.7 m2. Inside Double Three (ID3) A cabin without a window, for three people. A double bed with an additional bed above it. Floor surface 9.7 m2. Inside Four (I4) A cabin without a window, for four people. Two bunk beds with two levels each. Floor surface 9.4 to 9.7 m2. Inside Four R (I4R) A cabin without a window, for four people, without a full-scale floor mat. Two bunk beds with two levels each. Floor surface 9.5 m2. Inside Two (I2) A cabin without a window, for two people. Two separate beds. Floor surface 9.4 m2. Inside Family (IF6) A combination of two separate cabins for a maximum of six people (at least one adult and two children). An interior door. One cabin has a double bed and the other has two bunk beds with two levels each. Floor surface 19.4 m2. Seaside HC Four (SH4) A cabin with a window, for four people. Designed for the disabled. Two bunk beds with two levels each. Floor surface 17.5 m2. Inside HC Four (IH4) A cabin without a window, for four people. Designed for the disabled. Two bunk beds with two levels each. Floor surface 14 m2. Double HC Four (DH4) A cabin with a window, for four people. Designed for the disabled. One double bed and one bunk bed. Floor surface 19.1 m2. Seaside HC Three (SH3) A cabin with a window, for three people. Designed for the disabled. A bunk bed with two lower beds and one upper bed. Floor surface 12.2 to 12.8 m2. Inside Piccolo Two (IP2) A small cabin without a window, for two people. One bunk bed. Floor surface 5.5 m2. Driver A small cabin without a window, for two people. One bunk bed. Floor surface 5.4 m2.

Background Viking Line had been planning new ships on the route from Turku to Stockholm for a long time.Enkvist, Liisa: , Turun Sanomat 16 June 2009. Accessed on 30 October 2010. The route had been trafficked by the ships MS Isabella and MS Amorella, both built in the late 1980s.

Viking Line designed advanced technical solutions for the Turku - Mariehamn - Stockholm route. According to the chief technical officer Kaj Jansson, the intent was to design fast ships with narrow hulls, which would travel lightly in the water and whose environmental effects would be minimal.Sjöström, Pär-Henrik: "Ensimmäinen uudisrakennus 18 vuoteen", Tie meren yli – Uranuurtajasta markkinajohtajaksi, pp. 197–198. Gothenburg: Breakwater Publishing AB, 2009. .

Viking Line was already in negotiations in 2009 with the Finnish natural gas company Gasum about using LNG as fuel for the new ship. Viking Line's CEO at the time Nils-Erik Eklund said that LNG was the fuel of the future in ship traffic and that Viking Line had been investigating it for a long time. Still in 2009 Eklund declined to comment whether the new ship would use LNG, one of the reasons being the development of its price. Still he emphasised that LNG would offer significant ecological benefits. For the use of LNG, a new LNG terminal would be built in Naantali or in the Pansio harbour area in Turku., Turun Sanomat 19 December 2009. Accessed on 30 October 2010.

In January 2010 Mikael Backman said that Viking Line was in negotiations with nine shipyards. Answers for the offer requests were awaited during the spring. In the same interview Backman said that Viking Line would decide on the order during 2010. He emphasised that it was not the intent to build a ship similar to MS Amorella but instead a fully different, significantly larger ship. Making larger ships would also cause renovation work with Viking Line's Turku and Stockholm terminals so they could handle increased passenger traffic.Viking Linen laivatilaus jo pitkällä , Turun Sanomat 19 January 2010. Accessed on 30 October 2010. The second level of the Turku terminal would be expanded, the passenger bridges would be elevated and the harbour would possibly have a new parking house. Backman also said that Viking Line would be happy to choose the Turku shipyard, even if the price was higher than with competing shipyards. However, supports received by competing shipyards gave them an advantage in the pricing contest.

On 3 June 2010 Viking Line announced that it had not received a satisfactory answer from the shipyards it had left an offer request at.Backman, Mikael: Viking Line ei ole saavuttanut tyydyttävää neuvottelutulosta telakoiden kanssa (Press release) 3 June 2010. Mariehamn: Viking Line. Accessed on 30 October 2010. Particularly the Turku shipyard took this announcement gravely, because Viking Line had in practice two options: order the ship from the Turku shipyard or do not order it at all. According to estimates, Viking Line would have had a great defeat in its image had it ordered the ship from abroad. The new ship order would still not have fulfilled the capacity of the Turku shipyard after it had finished its latest order at the time, Allure of the Seas in October 2010, but would still have kept it in action and its subcontractors working.Iso pettymys telakalle , Turun Sanomat 4 June 2010. Accessed on 30 October 2010. According to Backman, the ships would still be ordered, but he also said that there was no information on how far the order would be delayed.Viking Line ei tilaakaan uusia aluksia, Helsingin Sanomat 3 June 2010. Accessed on 30 October 2010.

According to Viking Line, the price was nowhere near right on any of the shipyards. Because of the practically nonexistent demands of the shipyards the order prices should have been reasonable, and the government support package should have levelled the price differences between the parties. Viking Line needed new ships to replace the old ones, and the contest between the ship companies should have favoured ship orders. Still, no order was made at the time.

In June 2010 Mikael Backman said Viking Line had left a new offer to STX Finland. Two shipyards were left in the negotiations at the time.Enkvist, Liisa: Risteilylautan tilaus pelasti Turun telakan. Turun Sanomat, 26 October 2010, 106th year, p. 11. Turku: TS-Yhtymä Oy.

On 25 October 2010 Viking Line and STX Finland drew up a contract to build the ship. According to Viking Line the contract still depended on environmental support from the Finnish state.Backman, Mikael: Aiesopimus (press release) 25 October 2010. Mariehamn: Viking Line. Accessed on 30 October 2010. On 26 October 2010 no decision to support Viking Line's ship order was made in the additional budget negotiations of the Finnish government. According to Prime Minister of Finland Mari Kiviniemi a provision to give the support would be extended to 2011, but possible decisions would be made in an economic-political minister board.Työllisyyden parantamiseen lisää 66 miljoonaa euroa, Helsingin Sanomat 26 October 2010. Accessed on 30 October 2010. The CEO of STX Finland Juha Heikinheimo said that conceptual design work of the ship had already been going on for a long time. According to him, the proper design work started as soon as the contract was signed. Viking Line was also in negotiations with Gasum about providing the gas to Turku and Stockholm. The ship order also depended on the result of the negotiations with Gasum.