Yrjö Mikael Helenius (21 January 1896 - 23 January 1964) was a Finnish politician, born in Keuruu. He was a member of the Parliament of Finland from 1936 to 1939 and from 1949 to 1951, representing the Social Democratic Party of Finland (SDP). He was a presidential elector in the 1937, 1940, 1943 and 1950 presidential elections.[1]