Thomas Cunningham Thayer is an American musician. Thayer was the lead guitarist and vocalist for the hard rock band Kiss from 2002 to 2023. He was also the lead guitarist for the band Black 'n Blue.

Kiss was an American rock band formed in New York City in 1973 by Paul Stanley, Gene Simmons, Ace Frehley, and Peter Criss. Known for their face paint and stage outfits, the group rose to prominence in the mid-1970s with shock rock-style live performances which featured fire-breathing, blood-spitting, smoking guitars, shooting rockets, levitating drum kits, and pyrotechnics. The band went through several lineup changes, with Stanley and Simmons remaining the only consistent members. The final lineup consisted of them, Tommy Thayer, and Eric Singer.