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Nihti (Swedish: Knekten) is an island on the Kruunuvuorenselkä water area in the Sörnäinen district in Helsinki, Finland. On the northern side of the Nihdinkanava channel is the island of Sompasaari.

Nihti was a part of the Sörnäinen Harbour until its closure in 2008 in favour of the new Vuosaari Harbour.
Nihti is being converted into a residential area with plans to build apartments for about 3,000 people. The island is an interchange point in the Helsinki tram network, as both the Pasila–Kalasatama line 13 and the Crown Bridges light rail lines pass through Nihti. Construction on the island started in July 2021. The first residents moved to Nihti in 2024.