Sienar Fleet Systems or SFS (owned by the massive company Santhe/Sienar Technologies) was a major starship manufacturer. Through their Sienar Design Systems subsidiary, they were also responsible for many drive and power systems.

Sienar Fleet Systems, along with many ship factories at the industrial universes, was one of the major suppliers of military vessels for the Axis of Empires: whereas KDY was famous for designing massive Star Destroyers, SFS was best-known as the supplier of the small, yet deadly TIE fighters. Yet SFS also created the massive I-a2b solar ionization reactor that powered the Imperial-class Star Destroyer and dictated the size and design of its mile-long hull: in effect, KDY built the Imperial-class around a huge Sienar drive system.

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