Eldor is a class M planet located in Sector 004 of the galaxy's Alpha Quadrant. It is the homeworld of the humanoid Eldorians.
In the 23rd century, the inhabitants of Eldor were at war with Norus.
In 2265, Commander Karth of the Eldor warship Lebron launched a mission that ended the war. (TOS comic: "Menace of the Moloth")