Delta system
The Delta system was an inhabited planetary system in the Alpha Quadrant. A planet in this system, Delta IV, was the homeworld for the Deltans; a sister planet, Delta IX, was a destination for commercial transports in 2328. (; )

In 2259, the system's location was labeled on a stellar cartography chart seen on the 's ready room viewscreen. The system's symbol had a blue color, which indicated that it had an affiliation with the . ()

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

In 3189, the location of Delta was denoted on a holographic star chart  of the galaxy at Federation Headquarters. ()

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Star systems