Alavus (Swedish: Alavo) is a town and municipality of Finland in the province of Western Finland. Part of the South Ostrobothnia region, it is located 52 kilometres (32 mi) southeast of Seinäjoki, 138 kilometres (86 mi) north of Tampere and 319 kilometres (198 mi) north of Helsinki. The town has a population of 10,634 (31 December 2025) and covers an area of 1,151.46 square kilometres (444.58 sq mi) of which 52.31 km2 (20.20 sq mi) is water. The population density is 9.78 inhabitants per square kilometre (25.3/sq mi). Neighbouring municipalities are Alajärvi, Kuortane, Seinäjoki, Virrat and Ähtäri.
Agriculture and forestry employ a significant share of the population. Most of the industry in Alavus is related to construction: materials, design and contractors. Alavus has 60 lakes with 324 kilometres (201 mi) of shoreline. The town is unilingually Finnish.
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