MS Arcadia is a cruise ship in the P&O Cruises fleet. The ship was built by Fincantieri at their shipyard in Marghera, Italy. At 83,000 tonnes, Arcadia is the third largest of seven ships currently in service with P&O Cruises. The ship officially entered service with the company in April 2005 and was named by Dame Kelly Holmes.

 Arcadia was ordered by Holland America Line in 2000 as their fifth Vista class vessel. In 2003 she was allocated to Cunard Line to become their Queen Victoria. Shortly before her launch the decision was made to transfer the ship to the P&O Cruises fleet. As a result, Arcadia has a Cunard style mast similar to those found on the RMS Queen Elizabeth 2 and the RMS Queen Mary 2. She also sports a modified QE2 style funnel (with cowling removed) instead of the traditional P&O style funnel found on the purpose built Oriana and Aurora.

 Arcadia uses the Azipod system which is an azimuthing electric propulsion drive where the propulsion motor is installed inside a submerged azimuthing (unlimited 360 degrees) pod and coupled directly to an extremely short propeller shaft. The variable speed electric (AC/AC) drive produces smooth torque over the entire speed range including zero speed. The Azipod propulsion system gives the ship outstanding manoeuvring capabilities. It allows full turns at high speed with a radius of less than a ship length. Almost equal speed can be achieved ahead and astern. Rudders as well as stern thrusters are obsolete if an Azipod propulsion is installed astern as it is capable of providing full thrust in all directions by setting the unit's direction angle simply with the vessel's steering control. The Azipod unit has no mechanical propulsion coupling as electric power is provided by a cable connection only, from the diesel-electric generators (Arcadia has six) to the electric motor installed in the gondola directly behind the propeller. Arcadia has two ABB Azipods.

 Arcadia made a scheduled refit at Lloyd Werft shipyard in Bremerhaven, Germany for a 24 day period from 26 November to 20 December 2008. She underwent a major refit to the stern, with 34 cabins added. Similar rear superstructure remodelling has already been carried out on two of Holland America Line's Vista class vessels, with the other two following in 2008 and 2009. During the refit, the Cyb@Study was converted to a cinema, The Screening Room, with seating for approximately 30 people. The computers in the Cyb@Study were moved to the Horizon Lounge and Library. Several public areas were refurbished including the Aquarius bar which was made larger.