Gregory or Greg may refer to one of the following:
- People
- Gregory (Lieutenant), a 24th century Starfleet lieutenant on the Enterprise-E
- Gregory (Lieutenant Commander), a 23rd century physicist on the USS Enterprise
- Greg Agalsoff, a lieutenant aboard the USS Voyager
- Gregory Black, a 22nd century United Earth Starfleet admiral
- Gregory Desjardins, a commander in Starfleet's JAG officer
- Gregory Diasourakis, a USS Enterprise-E security officer
- Gregory Dundas, a colony medic on Sheridan's World
- Greg Forte, a tactical officer aboard the USS Defiant
- Greg Hanson, a Starfleet security chief
- Gregory MacCray, captain of the USS Geronimo
- Gregori Markova, chief engineer of the USS Cooper
- Gregory Salamorn, a 23rd century Federation President
- Greg Thometz (Commandant), a 23rd century Commandant of Starfleet Academy
- Greg Thometz (Officer), a crewman aboard the USS Excelsior
- Gregory Quinn, a 24th century Starfleet admiral
- Gregory Tree, a 23rd century Starfleet commodore
- Other topics
- Greg and Maris, a tap-dance duo
- Real-world topics
- Greg Adams, a Marvel Comics inker
- Greg Bear, a TOS novelist
- John Gregory Betancourt, a TNG, DS9, and VOY novelist
- Greg Brodeur, a TNG, VOY, and SCE novelist
- Greg Cox, a novelist and short story author
- Greg Ellis, a television and video game actor
- Greg K. Poehlein, a FASA RPG developer and author
- Greg Stolze, a Last Unicorn RPG author
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