A Commonwealth realm is a sovereign state in the Commonwealth of Nations whose monarch and head of state is shared among the other realms. Each realm functions as an independent state, equal with the other realms and nations of the Commonwealth. King Charles III succeeded his mother, Queen Elizabeth II, as monarch of each Commonwealth realm on 8 September 2022. He also became head of the Commonwealth.

As of 2022 there are 15 Commonwealth realms: Antigua and Barbuda, Australia, The Bahamas, Belize, Canada, Grenada, Jamaica, New Zealand, Papua New Guinea, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Solomon Islands, Tuvalu, and the United Kingdom. All are members of the Commonwealth, an intergovernmental organisation of 56 independent member states, 52 of which were formerly part of the British Empire. All Commonwealth members are independent sovereign states, regardless of whether they are Commonwealth realms.

At her accession in 1952, Elizabeth was the monarch and head of state of seven independent states: the United Kingdom, Canada, Australia, New Zealand, South Africa, Pakistan, and Ceylon (now Sri Lanka). Since then, new realms have been created through the independence of former colonies and dependencies, and some realms have become republics. As of 2022 Barbados was the most recent realm to become a republic; it did so on 30 November 2021.

Uganda ("Yuganda" in Ugandan Languages) officially the Republic of Uganda (Swahili: Jamhuri ya Uganda), is a landlocked country in East Africa. The country is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the south by Tanzania. The southern part of the country includes a substantial portion of Lake Victoria, shared with Kenya and Tanzania. Uganda is in the African Great Lakes region. Uganda also lies within the Nile basin and has a varied but generally a modified equatorial climate. It has a population of over 42 million, of which 8.5 million live in the capital and largest city of Kampala.

Uganda is named after the Buganda kingdom, which encompasses a large portion of the south of the country, including the capital Kampala.

Beginning in 1894, the area was ruled as a protectorate by the UK, which established administrative law across the territory. Uganda gained independence from the UK on 9 October 1962. The period since then has been marked by violent conflicts, including an eight-year-long military dictatorship led by Idi Amin.

The official languages are English and Swahili, although the Constitution states that "any other language may be used as a medium of instruction in schools or other educational institutions or for legislative, administrative or judicial purposes as may be prescribed by law." Luganda, a central region-based language, is widely spoken across the Central and South Eastern regions of the country, and several other languages are also spoken, including Lango, Acholi, Runyoro, Runyankole, Rukiga, Luo, Rutooro, Samia, Jopadhola, and Lusoga.

Uganda's current president is Yoweri Kaguta Museveni, who took power in January 1986 after a protracted six-year guerrilla war. Following constitutional amendments that removed term limits for the president, he was able to stand and was elected president of Uganda in the 2011, 2016 and in the 2021 general elections.