Jarkko Kalevi Ahola (Toijala, 24 August 1977) is a performing artist, a composer and a singer. He is the vocalist and bass player and one of the three songwriters of the band Teräsbetoni. He is also a member of a Finnish symphonic metal cover supergroup Northern Kings together with Marco Hietala from Nightwish, Tarot and Sapattivuosi, Tony Kakko from Sonata Arctica and Juha-Pekka Leppäluoto from Charon and Harmaja.