Karl Martin Sinijärv (born 4 June 1971) is an Estonian journalist and poet. Sinijärv was born in Tallinn. By 2011, he had published 8 poetry books and a cookbook. His poetry has been characterized as etnofuturist, bringing estrangement of language to the brink of self-parody. Sinijärv's first book of poems was published in 1989 in a collection with three other poetry books by Tõnu Trubetsky, Ringo Ringvee and Märt Väljataga. Sinijärv was the chairman of the Estonian Writers' Union from 2007–2016.