• In Africa: Nigeria, Gold Coast (present-day Ghana), Sierra Leone, Gambia, Kenya, Uganda, Tanganyika (present-day Tanzania), Nyasaland (present-day Malawi), Northern Rhodesia (present-day Zambia), Southern Rhodesia (present-day Zimbabwe), Bechuanaland (present-day Botswana), Swaziland, and Basutoland (present-day Lesotho).
• In the Americas: Jamaica, Bahamas, Bermuda, Trinidad and Tobago, British Guiana (present-day Guyana), British Honduras (present-day Belize), and the Falkland Islands.
• In Asia: India, Ceylon (present-day Sri Lanka), Malaya (present-day Malaysia), Burma (present-day Myanmar), North Borneo (present-day Sabah, Malaysia), Sarawak, Singapore, and Hong Kong.
• In the Middle East: Aden (present-day Yemen), Cyprus, Iraq, Palestine, and Transjordan (present-day Jordan).
• In Oceania: Australia, New Zealand, Fiji, Papua New Guinea, Solomon Islands, and numerous other islands in the Pacific.
These colonies played a significant role in the British war effort during World War I, providing men, resources, and economic support.