William V, Prince of Orange (Willem Batavus; 8 March 1748 – 9 April 1806) was the last Stadtholder of the Dutch Republic. He went into exile to London in 1795. He was the reigning Prince of Nassau-Orange until his death in 1806. In that capacity he was succeeded by his son William.

William Batavus was born in The Hague on 8 March 1748, the only son of William IV, who had the year before been restored as stadtholder of the United Provinces. He was only three years old when his father died in 1751, and a long regency began. His regents were:

William was made the 568th Knight of the Order of the Garter in 1752.

William V assumed the position of stadtholder (chief executive) and Captain-General of the Dutch States Army in 1766. On 4 October 1767 in Berlin, Prince William married Princess Wilhelmina of Prussia, the daughter of Augustus William of Prussia, niece of Frederick the Great and a cousin of George III. He became an art collector and in 1774 his Galerij Prins Willem V was opened to the public.

The position of the Dutch during the American War of Independence was one of neutrality. William V, leading the pro-British faction within the government, blocked attempts by pro-independence, and later pro-French, elements to drag the government to war in support of the Franco-American alliance. However, things came to a head with the Dutch attempt to join the Russian-led League of Armed Neutrality, leading to the outbreak of the Fourth Anglo-Dutch War in 1780. In spite of the fact that Britain was engaged in fighting on several fronts, the war went badly for the badly prepared Dutch and the Republic was eventually forced to cede some territory to the British. After much political debate and pressure from American and French diplomats such as John Adams, Joan van der Capellen tot den Pol and Court Lambertus van Beyma took the initiative.

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