
Robert O'Reilly (born March 25, 1950, in New York City) is an American film, stage, and television actor and director. He is best known for his role as Chancellor Gowron, the leader of the Klingon Empire, in the Star Trek franchise—particularly on Star Trek: The Next Generation and Star Trek: Deep Space Nine.
O'Reilly’s career spans over 100 films and TV episodes, often portraying antagonistic or villainous characters. He appeared in series like Cheers, Knight Rider, MacGyver, NYPD Blue, and films such as The Mask. He has also performed on Broadway and at Carnegie Hall. Notably, he received a Drama-Logue Award in 1981 for directing the play Getting Out.
His first Star Trek appearance was in The Next Generation episode "Manhunt," but he is most recognized for playing Gowron from the episode "Reunion" onward, across several Next Generation and Deep Space Nine episodes, and related media including video games. O'Reilly drew inspiration for Gowron from Shakespearean characters, notably Edmund from King Lear. He has reprised Gowron in various Star Trek-related events and conventions.
In theater, he has appeared in Broadway and off-Broadway productions, including The Tavern, The Promise, and played roles like Edmund in King Lear. He has been active with the Colony Theatre Company in Burbank, California, both as an actor and director.
He is married to Judy O'Reilly, with whom he has triplet sons. His hobbies include golf and baseball.
Robert O'Reilly retired from acting but remains involved in the Star Trek community through conventions and voice roles

The Mask
1994 · as The Figure

Whore
1991 · as Younger Man in Car

Candyman: Day of the Dead
1999 · as L.V. Sacco

By Dawn's Early Light
1990 · as FEMA Radioman

The Omega Code
1999 · as Technician

Desert Kickboxer
1992 · as Paul

Steel Frontier
1995 · as Evermore

Roddenberry on Patrol
2003 · as Officer #2

The Circuit
2019

Star Trek: Deep Space Nine - The Way of the Warrior
1995 · as Gowron

Moonbase
1997 · as Karl Stark

Good Luck
1997 · as Bartender

Star Trek: The Next Generation - Redemption
2013 · as Gowron

Under Surveillance
1991 · as Whitey

The Steel Collar Man
1985 · as Johnny

Party Plane
1991 · as Air Traffic Controller

Star Trek's Favorite Moments
2004 · as Self