Theta Omicron IV is the fourth planet in the Theta Omicron system.
In 2370, the planet was visited by the Federation starship USS Yorktown. The ship departed Theta Omicron, and was due to arrive at starbase Deep Space 9 on stardate 47550.1. (DS9: "Whispers")
Theta Omicron IV was not mentioned in dialog, but listed with the Yorktown on the arrival roster displayed on a desk viewscreen.