Jani Allan Kristian Liimatainen (born 9 September 1980) is a Finnish musician, songwriter and backing vocalist, currently a member of melodic death metal band Insomnium. He is the former guitarist and one of the founding members of the power metal band Sonata Arctica. He has also performed with Cain's Offering, Altaria and Stratovarius vocalist Timo Kotipelto (his bandmate in Cain's Offering). He was born in Kemi, and currently resides in Kotka.