| "Dr. Ivo Robotnik" may be referring to two or more different villains. If you're uncertain which one you're looking for, just flip a coin.|
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- Dr. Ivo "Eggman" Robotnik - the mainstream Dr. Ivo Robotnik (from "Sonic the Hedgehog" videogames).
- Dr. Eggman (Sonic Boom) - a version of Dr. Robotnik from Sonic Boom spin-off series.
- Dr. Robotnik (Sonic the Hedgehog OVA) - the movie version of Dr. Eggman, an absent-minded scientist, who is ready to destroy half of the planet for an "Adam and Eve plot".
- Dr. Ivo Robotnik (AoStH) - humorous version of Dr. Eggman from "Adventures of Sonic the Hedgehog" cartoon series.
- Dr. Eggman (Sonic X) - another humorous version of Dr. Robotnik from "Sonic X" anime series.
- Dr. Robotnik (Sonic The Hedgehog SATAM) - a darker version of Dr. Eggman from "Sonic The Hedgehog" cartoon series and the basis for Dr. Robotnik in Archie Comics.
- Dr. Robotnik (Sonic Underground) - a similar version of Dr. Robotnik from "Sonic Underground" cartoon series.
- Dr. Ivo Robotnik (Archie Comics) - the original version of Dr. Robotnik from Archie's "Sonic the Hedgehog" comics.
- Dr. Eggman (Archie Comics) - a version of Archie's Dr. Robotnik from alternate universe, who later takes the place of original Ivo Robotnik.
- Dr. Ivo Robotnik (Fleetway) - the version of Dr. Robotnik that inhabited the universe of "Sonic the Comic".
- Dr. Eggman Nega - A descendant of the original Dr. Ivo "Eggman" Robotnik from the videogames canon.
- Super Robotnik - A powerful supervillain ego of Dr. Ivo Robotnik.
- Dr. Eggman Nega - An empowered Doctor Robotnik who gained godlike powers.