James "Jim" Alan Johnston is a music composer who has been working for World Wrestling Entertainment since the 1980s; His work is often accredited to the name James A. Johnston.

Johnston is famous for writing many of the memorable entrance theme songs for WWE, including the theme songs for The Rock among hundreds of others. Initially composing TV themes for shows and commercial buffers, Johnston gravitated towards wrestlers entrance themes, before eventually becoming a complete music composer for the company.

Johnston has been recognized in entrance themes such as Triple H's "My Time" theme where he is referred to in the lyrics ("Yo Jimmy, hit me with that Triple H"). Silkk the Shocker also gives Johnston a shout out at the end of the song "I'm Comin'" (MVP's theme) when he says "Jim on the Track". He is also vocally featured on the WWE Originals album where he is featured in skits with Stone Cold Steve Austin between tracks.

In 1989, Johnston composed original music for No Holds Barred, a movie starring Hulk Hogan. Although the score was never commercially released, the theme "No Holds Barred", with vocals by John Joyce, was later released on WWE Anthology album in 2002. To date, this is the only movie soundtrack to his credit, although he is rumored to be involved with future WWE Studios projects.