The Lysians were a spacefaring species from Lysia in the Lysian system. Their government was the Lysian Alliance, and their military was headquartered in the Lysian Central Command.

In the mid-24th century, the Lysians were engaged in a decades-long war with the Satarrans. The weapon technology of both races were over a century behind those of contemporaneous Federation starships; Lysian armaments included disruptors, laser cannons, and cobalt fusion warheads.

In 2368, the Satarrans attempted to use the USS Enterprise-D to win the war. One of their operatives used a device to wipe the memories of the Enterprise crew and alter its computer records. According to the false information, the Enterprise had been tasked by Starfleet Command to destroy the Lysian Central Command, as part of a coordinated fleet action to end a Lysian-Federation war. The Satarran disguised himself as first officer "Kieran MacDuff" and worked to keep the mission going.

Although the Enterprise crew had not yet restored their memories by the time they reached the Central Command, Captain Jean-Luc Picard recognized the incongruity of the Lysians' vastly inferior defenses and decided to open communications with them. MacDuff's true nature was then exposed, and the Enterprise stood down. (TNG: "Conundrum")

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