Mark Thomas Tremonti (born April 18, 1974) is an American guitarist and singer, best known for his tenures with the rock bands Creed and Alter Bridge. He is a founding member of both bands, and has also collaborated with many other artists over the years. He formed his own band Tremonti in 2011 and has released five albums with them, including A Dying Machine, which was adapted by Tremonti and science fiction novelist John Shirley.

Since his early years with Creed, Tremonti has received positive recognition as a guitarist and songwriter and has received a number of accolades, including one Grammy Award for Creed's single "With Arms Wide Open". He was also named "Guitarist of the Year" for three consecutive years by Guitar World, and in 2011 he was listed in Total Guitar magazine as the fourth-greatest heavy metal guitarist of all time.