Jim Armstrong (born November 24, 1941) is an influential Northern Irish guitarist and songwriter, best known for his work with the band Them, which featured Van Morrison. Armstrong's genre primarily encompasses rock and blues, with a distinct influence from the 1960s garage and psychedelic rock scenes. He played a crucial role in the band's early success, contributing to their classic tracks such as "Gloria" and "Here Comes the Night." After leaving Them, Armstrong pursued a solo career and collaborated with various artists. His guitar work and songwriting have been noted for their emotive style and innovative sound, which helped shape the landscape of rock music during that era. Armstrong's impact on music is significant, particularly in the way he blended traditional blues elements with the emerging rock scene. His contributions to Them solidified the band's legacy in the canon of rock history, influencing subsequent generations of musicians. Although he may not have achieved the same level of fame as some of his contemporaries, his work remains respected within music circles for its authenticity and creativity.