The Klaestron are a spacefaring humanoid civilization from the planet Klaestron IV located in the Alpha Quadrant.
Klaestron were made distinguishable from humans by streak-like protrusions on the side of their head above their ears. Their outer ears consists only of a hole in their head.
The they had a civil war that took place in the mid 24th century. They had a extradition treaty with the Federation. They were allies with the Cardassians in 2369. (DS9: "Dax")
In 2371, they developed a new burn treatment technology. Doctor Julian Bashir visited to review the new technology. (DS9: "Second Skin")
The Klaestron were listed as Federation members in 2378. (ST reference: Star Charts)
- The Klystron race mentioned in the DS9 novel: Betrayal may have been intended to be the Klaestrons.