Jack Grisham (born July 22, 1961) is an American rock singer from Southern California. He is the vocalist for the punk rock band T.S.O.L. (True Sounds of Liberty), which emerged from the late 1970s Los Angeles hardcore punk rock scene, along with Black Flag, Circle Jerks and Bad Religion. Grisham has also fronted the bands Vicious Circle, the Joykiller, Tender Fury and Cathedral of Tears. He records with T.S.O.L., the Joykiller and the Manic Low.

Jack Grisham was born in Long Beach, California. Grisham's father, a career military man with 30 years in the Navy and Coast Guard, died in 1984. Grisham's mother was a military housewife. Grisham was one of five children and has an older sister, two older brothers, and a younger sister.

Grisham's older sister was part of the hippie subculture (or as he calls it, "Late 60's protest crap"). As a result, by the time he was six years old, Grisham was reading publications like Fritz the Cat and Zap Comix, and listening to albums by Frank Zappa and the Mothers of Invention, the Beach Boys, the Ventures, etc. Grisham cites the albums We're Only in it for the Money and Let it Bleed as two of his musical influences.

In his early life, Grisham's family moved back to Long Beach, California. Growing up, he was a rebellious youth heavily into surfing, skateboarding, and in his words "causing trouble."

While in high school, he met future T.S.O.L. drummer Todd Barnes through a girlfriend. Grisham and Barnes became friends, and took off with the girlfriend's guitar and amplifier and began playing around with sounds. In the beginning, Grisham claims, "All we did was make a bunch of noise and yell, ‘Fuck the neighbors’ all day."

While in his teens, Grisham started experimenting with mood altering substances. Soon he became addicted to drugs and alcohol. He recalled, "I was a nut. I used to think I didn't have a problem because I didn't shoot up and I didn't take acid."

After several minor tangles with the law stemming from his drug and alcohol abuse Grisham attained sobriety on January 8th 1989. He has two daughters, Anastasia and Georgia, and resides in Huntington Beach, California.^{[citation needed]}

In 1978, Grisham began rehearsing as lead vocalist with future Joneses/The Klan/A.K.A. guitarist Steve Houston (a.k.a. Steve Dead) to form Vicious Circle with bassist Laddy Tirrell and future T.S.O.L. drummer Todd Barnes. Vicious Circle quickly got a following within the beach cities and Los Angeles punk rock scene. Vicious Circle was notorious for Ultra-violence at shows in the early days of punk rock. Grisham is later quoted as saying "Whatever the logic, the Vicious Circle was a maniac attractor."