Steven James Hyde (born c. September 18, 1959) is a fictional character from FOX Networks' That '70s Show played by Danny Masterson. He is Eric Forman's best friend and by the end of season one, his de facto adopted brother. Hyde represents the adolescent of the seventies that was suspicious of government and organizations.

Hyde was abandoned by his mother, (Katey Sagal), who only appeared in three episodes, two of which only her screaming voice calling from inside Hyde's house is heard. His stepfather, Bud (Robert Hays), had left some years earlier. A half brother was mentioned once in a Season 8 episode, though not much is known about him.

Hyde's best friend, and later foster-brother, is the nice, geeky Eric Forman. The two share probably the closest friendship out of the group, shown by how they care and rely on each other and each others' advice. When Hyde's mother left town at the end of the first season, Eric tried to persuade his parents to do something about his best friend's living conditions and thus Hyde was invited to live with the Formans, which Hyde does for the majority of the series. He is adopted into the Forman family, and lives in the basement of their house. When Red decided to kick Hyde out after an arrest for possession of drugs, Eric attempts to come to his rescue.

Hyde found a job working at the Foto Hut with his burned-out hippie boss Leo (Tommy Chong). Hyde and Leo become good friends until Leo suddenly left town, because he remembered that he was only supposed to stay in Point Place for a short time, yet stayed for eight years, leaving his family behind. Ironically enough, during his tenure in the Foto Hut, he was the more responsible worker between himself and Leo, even telling his own boss off for not doing his job. He gave the money he made to Red and Kitty to help them pay the bills. It is evidenced thus that Hyde has a sense of propriety and responsibility to rival that of his friend Eric's, yet is not proud of it as he is more accustomed to his stoner lifestyle.