Trill system
The Trill system was an inhabited planetary system in the Alpha Quadrant. A planet in this system, , was the homeworld for the Trills and the Trill symbionts. 

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. This system's symbol had a blue color, indicating that it was affiliated with the . ()

In 2399, the location of Trill was labeled in a a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This system was in or near to Federation space. ()

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Star systems