Islaja or Merja Kokkonen (born 19 May 1979) is a singer-songwriter and musician from Helsinki, Finland. Besides her solo career, she is a member of free improv and psychedelic folk bands Avarus, Kemialliset Ystävät, and the trio Hertta Lussu Ässä.
She has been compared to Björk, Syd Barrett, and Nico.
Her music is psychedelic and intimate using a large variety of instruments. She is a multi-instrumentalist.
As of 2017, she is based in Berlin.