Valtimo (lit. 'artery') is a former municipality of Finland. It was merged with the town of Nurmes on 1 January 2020.
It was located in the North Karelia region. In 2019, the municipality had a population of 2,140 and covered an area of 838.07 square kilometres (323.58 sq mi), of which 37.75 km2 (14.58 sq mi) was water. The population density was 2.553/km2 (6.613/sq mi). Neighbouring municipalities were Nurmes, Rautavaara and Sotkamo.
The municipality was unilingually Finnish.
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