Siim Lill (born November 2, 1987; pseudonym Slim Lill

is an Estonian poet, performance artist and culture manager. He is a founding member of groupings ISAH and Svabariiklased and a member of musical performance-angst-art collective Iso Pullo.

Siim Lill, along with Rauno Alliksaar, was nominated to the annual Culture Prize of Tartu (Culture Holder Award) in 2016.