The Kriosian system (also known as the Krios system) was an inhabited star system. A planet in this system, Krios Prime, was inhabited. This system was located on the border of Federation space in the region between sectors 21166 and 22079.

The USS Enterprise-D visited the system twice, in late 2367 and in 2368. (TNG: "The Mind's Eye", "The Perfect Mate")

According to the Star Trek Encyclopedia (4th ed., vol. 1, p. 445), the Kriosian system was a Klingon protectorate. It was the only Klingon protectorate bordering Federation space.
According to the Star Trek: Star Charts, page 63, the primary was a class G star. It had a magnitude of +5, which was the same brightness as Sol.

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