The Queen's Official Birthday is one of the significant holidays in Tuvalu, an island nation located in the Pacific Ocean. It is a public holiday that occurs annually on the second Saturday of June to celebrate the official birthday of Queen Elizabeth II, the reigning constitutional monarch of 16 of the 54 member states in the Commonwealth of Nations, including Tuvalu. This holiday demonstrates the Island's strong ties to the British monarchy, a relationship established throughout its history.

The day is marked with much pomp and grandeur in Tuvalu. There are a myriad of activities and events organized to commemorate the occasion, including traditional performances, street parades, and feasts. In many families, it is a time for gatherings and celebration. Even though it is a day to honour the Queen, it is also an opportunity for the Tuvaluans to exhibit their vibrant culture and heritage.

Interestingly, the exact date of the Queen's Official Birthday varies from country to country as it's not the Queen's real date of birth, which is on April 21. The tradition of celebrating the British Sovereign's birthday on a day other than their actual birthday goes back to the time of King George II in 1748. It was instituted in order to have a chance of better weather for the birthday parade known as Trooping the Colour. Tuvalu simply carries on this historic tradition, emphasising the island nation’s connection with the United Kingdom.