Zef'No was a Kressari male, the captain of the freighter Calondon. He was used by the Cardassians to supply arms to the Alliance for Global Unity in 2370. The Cardassians hoped that by using Zef'No and his people, they could destabilize Bajor leading to a withdrawal by the Federation. They could then re-conquer Bajor and Deep Space 9, as well as controlling the Bajoran wormhole. (DS9: "The Circle")

Zef'No was played by Mike Genovese, in his last Star Trek appearance.
According to the script, the pronunciation for Zef'No was "ZEF-no".
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