Ilmari Hannikainen (1892-1955) was a member of an influential Finnish music family. His father was a famous choral composer Pekka Juhani (P.J.) Hannikainen and his brothers were composer Väinö Hannikainen, violinist Arvo Hannikainen and conductor Tauno Hannikainen.
Ilmari Hannikainen studied at the University of Helsinki (1911–14) and continued his studies at the Musikakademie in Vienna as a pupil of Franz Schreker. He also studied under Alexander Siloti in St. Petersburg in 1915–17 and under Alfred Cortot in Paris in 1919.
After settling back to Finland Hannikainen taught piano at the Helsinki Conservatory. He was later appointed as Professor of Piano at the Sibelius Academy.
Hannikainen's composition style made a journey from late Romanticism towards Impressionism. The bulk of his oeuvre is written for the piano (including a one piano concerto) but he composed also chamber music, an opera, lieder and film scores.
Fennica Gehrman publishes Hannikainen's solo works, chamber music and his piano concerto.