Erkki Juhani Hartikainen (24 June 1942, in Finland – 11 July 2021) was the chairman of Atheist Association of Finland ("Suomen Ateistiyhdistys" in Finnish, an atheistic association in Finland). He qualified for a Master of Science in the University of Helsinki in 1967. His subjects were mathematics, theoretical philosophy and computer science. Hartikainen has been the chairman of Atheist Association of Finland since 1985.Hartikainen has served as the actuary since the late 1960s, for nearly 20 years as a teacher of mathematics and science in schools, and after that, since 1989, as teacher of information technology at a college in Vantaa. From 1994–1998, he worked as a statistician in Vantaa. Hartikainen retired in 2005.