Islaja or Merja Kokkonen (born May 19, 1979) is a singer-songwriter and musician from Helsinki, Finland. Besides her solo career, she is a member of free improv and psych folk bands Avarus, Kemialliset Ystävät, and the trio Hertta Lussu Ässä.

She has been compared to Björk, Syd Barrett, and Nico.