Pasi Rantanen (born 30 October 1969, in Helsinki, Finland) is a Finnish singer best known for his power metal band Thunderstone, of which he was a member from the band's creation in 2000[1] until 2007.

He rejoined Thunderstone in 2013 as a full-time member again and provided vocals for the band's comeback album "Apocalypse Again" in 2016.

Rantanen also served as a background singer on, amongst other things, Stratovarius, Kotipelto and Ari Koivunen albums.

In addition, the album Raskasta Joulua featured his talents on a version of "White Christmas".

Rantanen also appeared at the Eurovision 2006 performance by Lordi as a background singer wearing a mask of Gene Simmons from Kiss.