L-374 II was the uninhabited second planet of the L-374 system. This system was near and in the same sector as the L-370 system, and was near the Rigel system.

This was one of two planets spared in the planet killer attack of 2267; the other was L-374 I. The other two planets in the system, L-374 III and L-374 IV, were destroyed. When the crew of the badly-damaged USS Constellation was unaccounted for after the planet killer's attack, Spock considered it improbable that the ship's crew had fled to L-374 II as this planet had an atmosphere poisonous to Humans. (TOS: "The Doomsday Machine")

This planet was only mentioned in dialogue.
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