Haapakoski is a Finnish surname. Notable people with the surname include:
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Aarne Haapakoski
Aarne Haapakoski (1904 – 1961) was a Finnish pulp writer. He is known for a detective fiction series about architect/detective Klaus Karma and a science fiction series about a robot named Atorox. Both series were written under the pseudonym Out ...
(1904-1961), Finnish pulp writer
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Antti Haapakoski (born 1971), Finnish hurdler
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Mikko Haapakoski (born 1967), Finnish ice hockey defender
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Niko Haapakoski (born 1996), Finnish volleyball player
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Paula Haapakoski (born 1977), Finnish orienteering competitor
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Tapani Haapakoski (born 1953), Finnish Olympic pole vaulter
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Finnish-language surnames