Ishtar is the name of a planet in multiple works of science fiction. In Poul Anderson's Firetime the planet is also known as Bel III and Anubelea III. Anderson's Ishtar has four continents (Haelen, Beronnen, Valennen and Dejerine), two small moons, a mass 1.53 times that of Earth, gravity 1.18 times that of earth, and suffers from periodic cycle of climate emergency - civilizational collapse.

Ishtar is one of the many named planets in H. Beam Piper's Space Viking and also appears on page 6 of Piper's Little Fuzzy.