Mark Robert Boals (born December 5, 1958) is an American heavy metal singer and occasional bassist, renowned for his powerful vocals with Yngwie Malmsteen. He is also a contributing singer-songwriter and bassist for the band Foundry, who is produced by Linkin Park drummer Colin Brittain.

Boals' first album with Malmsteen, 1986's Trilogy, achieved platinum status in the US and sold several million copies worldwide. As a young child, he learned to play the piano and bass guitar. Although Boals has never had any vocal lessons or training, as a teenager he gained experience as a vocalist in local groups. Boals is the founder and vocalist for the band Ring of Fire, and had a brief stint as the bassist for Dokken.