Araya has also provided guest vocals to recordings by other artists, including "Iron Gland" from Alice in Chains's album Dirt, and "Terrorist" from Soulfly's album Primitive.

Araya has two children, a boy and a girl. He is married and lives in Buffalo, Texas, with his wife, whom he met at a Slayer show some time ago. His brother, Johnny Araya, is the bassist of the melodic death metal band, Thine Eyes Bleed.

Despite the anti-Christian and pseudo-Satanic nature of many of Slayer's songs, Araya has stated that he frequently went to church when he was younger. According to a interview he did, Tom believes that "...Christ came and taught us about love. About doing unto others. That was his preach: Accept each other for who we are. Live peacefully, and love one another. Period." And his response to the question "Do you believe in God?" is: "I believe in a supreme being, yeah. But He's an all-loving God".