Forsbäck is a part of the locality Onsala, situated in Kungsbacka Municipality on the west coast of Sweden. It has been registered as a småort in the Swedish system of cities and localities, but is nowadays just a part of Onsala.[1]

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57°27′00″N 12°02′56″E / 57.450°N 12.049°E / 57.450; 12.049