Haapanen is a Finnish surname. Notable people with the surname include:
Santeri Haapanen (1877–1957), Finnish schoolteacher, farmer and politician Jalmari Haapanen (1882–1961), Finnish farmer and politician Toivo Haapanen (1889–1950), Finnish conductor and music scholar Lauri Haapanen (1889–1947), Finnish wrestler Markus Haapanen (born 1996), Finnish ice hockey defenceman