Honkajoki (Finnish: [ˈhoŋkɑˌjoki]; Hongonjoki until 1952) is a former municipality of Finland. It was merged with the town of Kankaanpää on 1 January 2021.
It was located in the province of Western Finland and was part of the Satakunta region. The population of Honkajoki was 1,595 (31 December 2020) and the municipality covered an area of 331.22 km2 (127.88 sq mi) of which 1.8 km2 (0.69 sq mi) was inland water (1 January 2018). The population density was 20.76/km2 (53.8/sq mi).
The municipality was unilingually Finnish.
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