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Are the Solomon Islands Part of Papua New Guinea?

No. The Solomon Islands and Papua New Guinea are two entirely separate, independent sovereign nations in the Southwest Pacific.

Key Distinctions

Feature	Solomon Islands	Papua New Guinea
Capital	Honiara (Guadalcanal)	Port Moresby
Independence	July 7, 1978 (from UK)	Sept 16, 1975 (from Australia)
Land Area	28,896 km² (992 islands)	462,840 km² (eastern New Guinea + islands)
Population (2023)	~740,000	~10.3 million
Official Languages	English	English, Tok Pisin, Hiri Motu
Government	Constitutional monarchy (King Charles III)	Constitutional monarchy (King Charles III)

Geographic Relationship

They are neighbors: The Solomon Islands archipelago lies east of Papua New Guinea, separated by the Solomon Sea and Bougainville Strait (Bougainville Island is politically part of PNG but geographically the NW end of the Solomons chain).
Both are members of the Pacific Islands Forum, Melanesian Spearhead Group, and Commonwealth of Nations.
WWII history links them: The Guadalcanal Campaign (Solomons) and Kokoda Track / Bougainville Campaign (PNG) were adjacent theaters.

Confusion sometimes arises because Bougainville (autonomous region of PNG) is geographically part of the Solomon Islands chain, but politically PNG. The nation "Solomon Islands" excludes Bougainville.

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