The Loomis System was a star system settled by humans in the Verge of the Solarian League.

It had a G7 primary with two inhabited planets, Halkirk, where the capital of Elgin City was located, and Thurso, a water world with a much smaller population. The two worlds orbited the star together, with a common center of mass. There were also three gas giants and an asteroid belt.

It was home to the Republic of Loomis. (SI4)