Heino Wilhelm Daniel Kaski (21 June 1885, Pielisjärvi – 20 September 1957, Helsinki) was a Finnish composer, teacher and pianist.
His father taught him the violin, and was generally supportive: when Kaski dropped out of secondary school to study music full-time in Helsinki, he did not object.
There, he continued studying the violin, but was also tutored in theory (by Ilmari Krohn) and composition (by Erkki Melartin).
In 1911, on Jean Sibelius's recommendation, Kaski received a grant that enabled him to study for four years in Berlin, under Paul Juon.
In 1914 he returned to Finland; one of his larger works, Symphony in B minor, was composed in 1914–1919 under partial guidance from Selim Palmgren.