Tommy Shannon is an American bass guitarist, who is best known as a member of Double Trouble, a blues rock band led by Stevie Ray Vaughan. Born in Tucson, Arizona, Shannon moved to Dumas, Texas when he was nine, where he originally started as a guitarist, though he started playing bass at the age of 21. He appeared with Johnny Winter at Woodstock in 1969. He later joined Double Trouble in 1981 and became a permanent member of Double Trouble until Vaughan's death in 1990. Shannon and bandmate Chris Layton later formed supergroups such as the Arc Angels.

Double Trouble is an American blues rock band from Austin, Texas, which served as the backing band for singer-guitarist Stevie Ray Vaughan. The group was active throughout the 1980s and contributed to reviving blues music, inspiring many later blues and rock acts. Formed in Austin, Texas in 1978, the group went through several early line-up changes before settling on a power trio consisting of Vaughan, Chris Layton (drums), Tommy Shannon (bass). They became a four-piece by 1985 after adding Reese Wynans (keyboards). Whilst with Vaughan they were billed Stevie Ray Vaughan and Double Trouble. Rooted in blues and rock music, the group worked in various genres ranging from ballads to soul, often incorporating jazz and other musical elements.