Starbase 621
Starbase 621 was a Federation starbase administered by Starfleet. The starbase was located in the Alpha Quadrant.

The  was supposed to visit Starbase 621 in 2370, but delayed this mission for a few days to help in repairing the weather control system of the Caldos colony. ()

In 2374, Gul Dukat was being transported by the  to Starbase 621 for the beginning of his war crimes hearing when the ship was destroyed and Dukat fled. ()

In 2399, the location of Starbase 621 was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This base was in or near Federation space. ()

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bg:Звездна база 621
de:Sternenbasis 621
es:Base Estelar 621
ja:第621宇宙基地
nl:Sterrenbasis 621
0621, Starbase