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Grønningen Lighthouse (Norwegian: Grønningen fyr) is a coastal lighthouse in the municipality of Kristiansand in Agder county, Norway. The lighthouse was built in 1878 to improve the marking of the shipping lane into Kristiansand harbor. In 1842, the Russian ship-of-the-line Ingermanland had collided with the Grønningen islet, leading to a catastrophe. The current lighthouse sits on Grønningen, a bare islet in the , and it marks the eastern side of the main shipping channel that leads inland to the port of the city of Kristiansand. The other lighthouse, which marks the western entrance, Oksøy Lighthouse, lies about 2.2 kilometres (1.4 mi) to the west.