Soile Isokoski (born February 14, 1957 in Posio) is a Finnish lyric soprano. She is an opera singer as well as a concert and Lieder singer. She graduated from the Sibelius Academy in Helsinki (a cantor-organist diploma, a singing teacher's degree and a singing diploma) and made her concert debut there in 1986. Isokoski won the Lappeenranta song competition in Finland (1987), the Elly Ameling Competition in the Netherlands (1988) and the Tokyo International Singing Competition (1990). In 1987 she won 2nd prize in the BBC Singer of the World competition in Cardiff.