Gregory Jein (also known as Greg Jein) was a Starfleet officer in the 24th century. He was a captain in 2363.

In 2368, he was listed as a yard engineer on the second version of the dedication plaque of the USS Enterprise-D. (TNG: "Silicon Avatar", dedication plaque)

In the 2370s, he was listed as a Tactical Operations officer on the dedication plaque of several Federation starships. (DS9: "The Search, Part I", dedication plaque; VOY: "Caretaker", dedication plaque; DS9: "The Dogs of War", dedication plaque)

This character was only mentioned in writing.
He was named after production staff associate Gregory Jein.
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