Commemoration of the end of the German occupation of the Channel Islands related observances: Liberation Day, commemorating the end of the German occupation of the Channel Islands during World War II. (Guernsey and Jersey)

Liberation Day is the national day of both Guernsey and Jersey, the two largest of the Channel Islands, which takes place on 9 May each year. It commemorates the liberation of the Channel Islands on 9 May 1945, which marked the end of the islands' occupation by Nazi Germany during World War II. It falls on the same day as the European Union's Europe Day, which celebrates post-World War II peace and European unity. 9 May is a public holiday in both islands and each has different celebrations and commemorative events; the centrepiece of Jersey's is the Liberation Day re-enactment in the Liberation Square, while Guernsey's is an islandwide cavalcade of classic vehicles.

The military occupation of the Channel Islands by Nazi Germany lasted for most of the Second World War, from 30 June 1940 until liberation on 9 May 1945. The Bailiwick of Jersey and Bailiwick of Guernsey are British Crown dependencies in the English Channel, near the coast of Normandy. The Channel Islands were the only de jure part of the British Empire in Europe to be occupied by Nazi Germany during the war. Germany's allies Italy and Japan also occupied British territories in Africa and Asia, respectively.

Guernsey is the second-largest island in the Channel Islands, located 27 miles (43 km) west of the Cotentin Peninsula, Normandy. It is the largest island in the Bailiwick of Guernsey, which includes five other inhabited islands – Alderney, Herm, Jethou, Lihou and Sark – and many small islets and rocks. The bailiwick has a population of 63,950, the vast majority of whom live on Guernsey, and the island has a land area of 24 square miles (62 km²).

Jersey, officially the Bailiwick of Jersey, is an autonomous and self-governing island territory of the British Islands. Although as a British Crown Dependency it is not a sovereign state, it has its own distinguishing civil and government institutions, so qualifies as a small nation or island country. Located in Northwestern Europe, off the coast of north-west France, it is the largest of the Channel Islands and is 14 miles (23 km) from Normandy's Cotentin Peninsula. The Bailiwick consists of the main island of Jersey and some surrounding uninhabited islands and rocks including Les Dirouilles, Les Écréhous, Les Minquiers, and Les Pierres de Lecq.