Alanen is a Finnish surname. Notable people with the surname include:
Emmi Alanen (born 1991), Finnish footballer Ivar Alanen (1863–1936), Finnish politician Jere-Matias Alanen (born 1996), Finnish professional ice hockey winger Lilli Alanen (1941–2021), Finnish philosopher Pekka Alanen (born 1945), Finnish wrestler Pirre Alanen (born 1965), Finnish restaurateur