The European discoverer of the Solomons was the Spanish explorer Alvaro de Mendana Y Neyra, who set out from Peru in 1567 to seek the legendary Isles of Solomon. British mariner Philip Carteret entered Solomon waters in 1767. In the years that followed, visits by explorers were more frequent.

Missionaries began visiting the Solomons in the mid-1800s. They made little progress at first, because "blackbirding"--the often brutal recruitment of laborers for the sugar plantations in Queensland and Fiji--led to a series of reprisals and massacres. The evils of the labor trade prompted the United Kingdom to declare a protectorate over the southern Solomons in 1893. In 1898 and 1899, more outlying islands were added to the protectorate; in 1900 the remainder of the archipelago, an area previously under German jurisdiction, was transferred to British administration. Under the protectorate, missionaries settled in the Solomons, converting most of the population to Christianity.

In the early 20th century, several British and Australian firms began large-scale coconut planting. Economic growth was slow, however, and the islanders benefited little. With the outbreak of World War II, most planters and traders were evacuated to Australia, and most cultivation ceased.

From May 1942, when the Battle of the Coral Sea was fought, until December 1943, the Solomons were almost constantly a scene of combat. Although U.S. forces landed on Guadalcanal virtually unopposed in August 1942, they were soon engaged in a bloody fight for control of the islands' airstrip, which the U.S. forces named Henderson Field. One of the most furious sea battles ever fought took place off Savo Island, near Guadalcanal, also in August 1942. Before the Japanese completely withdrew from Guadalcanal in February 1943, over 7,000 Americans and 21,000 Japanese died. By December 1943, the Allies were in command of the entire Solomon chain. The large-scale American presence toward the end of the war, which dwarfed anything seen before in the islands, triggered various millennial movements and left a lasting legacy of friendship.

In 1960, an advisory council of Solomon Islanders was superseded by a legislative council, and an executive council was created as the protectorate's policymaking body. The council was given progressively more authority.

In 1974, a new constitution was adopted establishing a parliamentary democracy and ministerial system of government. In mid-1975, the name Solomon Islands officially replaced that of British Solomon Islands Protectorate. On January 2, 1976, the Solomons became self-governing, and independence followed on July 7, 1978.