- Ianus (1994) - 5000 Iberville St, Studio #332, Montreal, Quebec, H2H 2S6 CANADA.
- I Box Publishing (1994) - P.O. Box 6671, stn A, Toronto, Ontario, M5W 1X5 CANADA.
- IC Graphics - Publisher of Blonde Avenger Comics and related material.
- Illegal Batman (1994) - 43 Finsen Road, London SE5 9AW ENGLAND.
- Illusion Studios - Small publisher in the late 1990's.
- Illustration Studio - Steve Woron's company. CBG#822 pg 55 ad.
- Image Comics - A collective of studios that publish under one imprint.
- Imperial Comics - Late 1980's b/w publisher.
- Independent-Comics.Com - Publisher of Deposit Man.
- Independent Comics Group - Mid 1980's b/w publisher.
- Inferno Studios - Publisher of Zomboy.
- Infinity (1983) - Publisher of Escape To the Stars. (Ad in Glenwood Nov. 1983 catalog.)
- Ink Publishing - Late 1980s publisher.
- Innovation Publishing - Late 1980's/early 1990's b/w and color book publisher.
- Insight Studios
- Irjax Enterprises - An early Schuster Bros. company that published magazines about comic books.
- IW Comics - color reprint publisher of the late 1950's and early 1960's.