The term Prince is used to refer to the children of royalty, the term (or an equivalent of it in the peoples native tongue) is used on almost every world.
- Astok of Dusar; abducted Princess Thuvia of Ptarth and tried to make it look like his rival Carthoris had done it to cause a war between Helium and Ptarth.
- John Carter of Helium and Warlord of Mars
- Carthoris of Helium
- Haj Alt of Tjanath
- Jad-Han of Amhor, an ally of John Carter
- Jal Had of Amhor; invaded Duhor in attempt to kidnap Princess Valla Dia
- Mu Tel of Toonol; attempted to overthrow his uncle Vobis Kan, the Jeddak of Toonol
- Pnoxux of Invak
- Sab Than of Zodanga; tried to force Princess Dejah Thoris of Helium to marry him in exchange for peace between the two kingdoms. Later killed by Tars Tarkas.
- Sovan of Ptarth, Jedwar of the Ptarthian navy
- Talu of Marentina; nephew of Salensus Oll, the Jeddak of Okar