Ostrobothnians (Finnish: Pohjalaiset, IPA: [ˈpohjɑˌlɑi̯set]) are a subgroup (heimo) of the Finnish people who live in the areas of the historical province of Ostrobothnia in the northwestern parts of Finland.

Ostrobothnians descend from Tavastians and Savonians, the latter started to settle in Ostrobothnia during the 1500s.

[1][2] A notable historical event involving the Ostrobothnians is the Cudgel War, in which peasants led by the local rebel leader Jaakko Ilkka rose in a revolt against the nobility during the Swedish rule.

'leaf's'), the middle vowel in tylysä (Finnish: tylsä, lit.

'boring') and the diphthongs uo, yö and ie changing into ua, yä and iä.