Franz Joseph II, Prince of Liechtenstein (Franz Joseph Maria Aloys Alfred Karl Johannes Heinrich Michael Georg Ignaz Benediktus Gerhardus Majella), (16 August 1906, Schloss Frauenthal, Styria, Austria – 13 November 1989, Grabs, Switzerland) was the Sovereign Prince of Liechtenstein from 1938 until his death. His full title was Fürst von und zu Liechtenstein, Herzog von Troppau und Jägerndorf, Graf zu Rietberg.

He was the son of Prince Aloys of Liechtenstein and his wife Archduchess Elisabeth of Austria (daughter of Archduke Karl Ludwig). He succeeded his childless cousin, Prince Franz I, after his father renounced his right of succession in his favour in 1921.

During his reign women received voting rights for the first time, following a referendum on the topic (among men only) in 1984.

Franz Joseph was an extremely popular sovereign in Liechtenstein. He was the first ruling prince to live full time in the principality. He also oversaw the economic development of Liechtenstein from a poor agricultural backwater into one of the richest countries (per capita) in the world.

He was the 1,240th Knight of the Order of the Golden Fleece in Austria.

Liechtenstein remained neutral throughout World War II, and its neutrality was never violated by any of the combatants. However, two factors have linked the Liechtensteinian State to the Axis cause:

• In 2005, it was revealed that Franz Joseph II profitted directly from the Holocaust. Labourers from the Strasshof concentration camp, provided by the SS, had worked on estates in Austria owned by the Liechtensteinian Princely House.
• At the end of the war, Liechtenstein gave asylum to about 500 soldiers of the First Russian National Army (a collaborationist Russian force within the German Wehrmacht). Eventually, Argentina agreed to permanently resettle the asylum seekers. In contrast, the British Army sent Russians they had captured who had fought on the side of Germany against the Soviet Union to the USSR where they were sent into the Gulags.

On 7 March 1943, at Vaduz, Franz Joseph II married Georgine ("Gina") Countess of Wilczeck (24 October 1921 – 18 October 1989). They had five children.