Lumijoki is a municipality of Finland.

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Lumijoki
Municipality
Lumijoen kunta Lumijoki kommun
Coat of arms
Location of Lumijoki in Finland
Coordinates: 64°50.2′N 025°11.2′E
Country	Finland
Region	North Ostrobothnia
Sub-region	Oulu
Charter	1867
Government
• Municipal manager	Paula Karsi-Ruokolainen
Area  (2018-01-01)[1]
• Total	290.29 km2 (112.08 sq mi)
• Land	214.12 km2 (82.67 sq mi)
• Water	77.1 km2 (29.8 sq mi)
• Rank	259th largest in Finland
Population  (2023-12-31)[2]
• Total	2,033
• Rank	257th largest in Finland
• Density	9.49/km2 (24.6/sq mi)
Population by native language [2]
• Finnish	95.3% (official)
• Swedish	0.2%
• Others	4.5%
Population by age [3]
• 0 to 14	27%
• 15 to 64	54.4%
• 65 or older	18.6%
Time zone	UTC+02:00 (EET)
• Summer (DST)	UTC+03:00 (EEST)
Website	www.lumijoki.fi

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It is located in the Northern Ostrobothnia region. The municipality has a population of 2,033 (31 December 2023)^[2] and covers an area of 290.29 square kilometres (112.08 sq mi) of which 77.1 km² (29.8 sq mi) is water.^[1] The population density is 9.49 inhabitants per square kilometre (24.6/sq mi).

Neighbouring municipalities are Hailuoto, Liminka, Oulu and Siikajoki.

The municipality is unilingually Finnish.^[4]

Lumijoki literally means "snow river", most likely through Lumijärvi, the lake from which the river Lumijoki once began from. Toponyms with the word lumi usually refer to areas where the snow stays for longer than in nearby areas. The village was first mentioned in 1548, when it was a part of the Liminka parish. It gained chapel rights in 1640, eventually becoming an independent parish and municipality in 1867.^[5]