Hannikainen is a Finnish surname. People with this name include:
Pekka Juhani Hannikainen (1854–1924) Finnish composerIlmari Hannikainen (1892–1955) Finnish pianist and composerTauno Hannikainen (1896–1968) Finnish cellist and conductorAnn-Elise Hannikainen (1946–2012) Finnish composerLauri Hannikainen (1889–1921), journalist and writerMarkus Hännikäinen (born 1993), Finnish ice hockey player