Pasi Rantanen (b. 1969 Helsinki, Finland) is a Finnish singer. Best known for his power metal band Thunderstone, where he was the band's creation in 2000 until the year 2007.

Rantanen also served as a background singer on, amongst other things, Stratovarius, Kotipelto and Ari Koivunen albums. In addition, the album Heavy Christmas 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.

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