Lejonis is an inhabited planet in the Alpha or Beta Quadrants. The planet is located in the Celeth star system and is politically neutral.

Zurin Dakal and his family fled to Lejonis from Cardassian space during the Dominion War. (TTN novel: Sword of Damocles)

In the 2370s, Thrax Sa'kat was operating an underground railroad transporting civilians from Cardassia to Lejonis to escape the Dominion. In 2375, a Lurian freighter carrying such people was destroyed by a catastrophic accident, although several Cardassian children were saved. (DS9 - Prophecy and Change short story: "Foundlings")