Äänekoski (Finnish pronunciation: [ˈæːneˌkːoski]) is a town in Finland, located in the Central Finland region, about 45 kilometres (28 mi) north of Jyväskylä, the region's capital city. Äänekoski has a population of 17,492, as of 31 December 2025, and covers an area of 1,138.39 square kilometres (439.53 sq mi) of which 253.84 km2 (98.01 sq mi), or 22%, is water. The population density is 19.77 inhabitants per square kilometre (51.2/sq mi).
Neighbouring municipalities are Kannonkoski, Konnevesi, Laukaa, Saarijärvi, Uurainen, Vesanto and Viitasaari.
The municipality is unilingually Finnish.
The municipality of Äänekosken maalaiskunta was consolidated to Äänekoski in 1969 and the municipality of Konginkangas in 1993. The municipalities of Sumiainen and Suolahti were consolidated to Äänekoski in 2007.
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