The Bubi people are a Bantu ethnic group of Central Africa who are indigenous to Bioko Island, Equatorial Guinea. Once the majority group in the region, the population experienced a sharp decline due to war and disease during Portuguese expeditions. By the end of Spanish colonial rule in the mid 20th century, and after substantial intermarriage with newly introduced populations, such as Afro-Cubans, Krio people, Portuguese people and Spaniards, the Bubi people, again, experienced a great decline in number. Seventy-five percent perished due to tribal/clan rooted political genocide during a civil war that led to Spanish Guinea's independence from Spain. This, too, sparked mass exodus from their homeland with most of the exiles and refugees immigrating into Spain. The indigenous Bubi of Bioko Island have since co-existed with non-indigenous Krio Fernandinos; and members of the Fang ethnic group, who have immigrated in large numbers from Río Muni. Once numbering approximately 3 million, the Bubi currently number around 100,000 worldwide.

Bioko is an island 32 km (20 mi) south of the coast of Cameroon, and 160 km (99 mi) northwest of the northernmost part of mainland Equatorial Guinea. Malabo, on the north coast of the island, is the capital city of Equatorial Guinea. Its population was 335,048 at the 2015 census and it covers an area of 2,017 km2 (779 sq mi). The island is part of the Cameroon line of volcanoes and is located off the Cameroon coast, in the Bight of Biafra portion of the Gulf of Guinea. Its geology is volcanic; its highest peak is Pico Basile at 3,012 m (9,882 ft).