Art therapy is a masters-level profession so graduate study is required to become an art therapist. Most art therapy graduate programs require applicants have completed 18 studio art credits and at least 12 psychology credits and can come from a fine arts or psychology undergraduate program. Once you complete your master's degree in art therapy, you then work to acquire client contact hours and supervision hours, both requirements to earn your board certification in art therapy from the Art Therapy Credentials Board. You can learn more about becoming an art therapist from the Accreditation Council for Art Therapy Education website.