Atrea IV was the inhabited fourth planet in its star system. It was the homeworld of the humanoid Atreans. The planet was governed by the Atrean government.

In 2370, it was discovered that Atrea IV's molten core was solidifying, which was affecting the planet's gravitational field and seismic activity had increased by a factor of three. Dr. Juliana Tainer, a Human geologist living on the planet, estimated that it would become uninhabitable in thirteen months. The USS Enterprise-D was sent in response to a request by the planet's government for help in averting this natural disaster. Lieutenant Commanders Data and Geordi La Forge were teamed up with the Atrean geologist Doctor Pran Tainer and his wife Dr. Julian Tainer. They developed a means to re-liquify the core using a ferro-plasmic infusion, which injected heat into the planet to stabilize the core for centuries. (TNG: "Inheritance")

"A-tree-uh" was the pronunciation for this planet's name from the script pronunciation guide.
The Star Trek Encyclopedia (4th ed., vol. 1, p. 50) classified Atrea IV as a class M planet.
According to the Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Atrea IV was listed as a Federation member.

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