|Known for||Creating Klingon and Atlantean|
|Thesis||Mutsun Grammar (1977)|
|Doctoral advisor||Mary Haas|
|Other advisors||William F. Shipley|
Marc Okrand ( //; born July 3, 1948) is an American linguist. His professional work is in Native American languages, and he is well known as the creator of the Klingon language in the Star Trek science fiction franchise.
As a linguist, Okrand worked with Native American languages. He earned a bachelor's degree from the University of California, Santa Cruz in 1970. His 1977 doctoral dissertation from the University of California, Berkeley, was on the grammar of Mutsun, an extinct Ohlone language formerly spoken in the coastal areas of north-central California. His dissertation was supervised by pioneering linguist Mary Haas. From 1975 to 1978, he taught undergraduate linguistics courses at the University of California, Santa Barbara, before taking a post-doctoral fellowship at the Smithsonian in Washington, D.C., in 1978. 
After that, Okrand took a job at the National Captioning Institute, where he worked on the first closed-captioning system for hearing-impaired television viewers. Until his retirement in 2013, Okrand served as one of the directors for Live Captioning at the National Captioning Institute and as President of the board of directors of WSC Avant Bard (formerly the Washington Shakespeare Company) in Arlington, Virginia, which planned to stage "an evening of Shakespeare in Klingon" in 2010.  
While coordinating closed captioning for the Oscars award show in 1982, Okrand met the producer for the movie Star Trek II: The Wrath of Khan.  His first work was dubbing in Vulcan language dialogue for Star Trek II: The Wrath of Khan, since the actors had already been filmed talking in English. He was then hired by Paramount Pictures to develop the Klingon language and coach the actors using it in Star Trek III: The Search for Spock, Star Trek V: The Final Frontier, Star Trek VI: The Undiscovered Country. He was later hired for the use of the Romulan and Vulcan languages in the Star Trek film in 2009.  He also created Klingon dialogue for that movie, but those scenes were cut.  He was involved in Star Trek Into Darkness, but only during post-production. 
Okrand is the author of three books about Klingon – The Klingon Dictionary (first published 1985, revised enlarged edition 1992), The Klingon Way (1996) and Klingon for the Galactic Traveler (1997), as well as two audio-courses: Conversational Klingon (1992) and Power Klingon (1993). He has also co-authored the libretto of an opera in the Klingon language: ’u’ [a], debuting at The Hague in September 2010. He speaks Klingon, but notes that others have attained greater fluency. 
- Wall Street Journal Helping the Hearing Impaired And Voicing the Klingons, May 14, 2009
- Washington Post: How the Washington Shakespeare Company came to offer Shakespeare in Klingon
- "WSC press release" (PDF). Archived from the original (PDF) on March 1, 2015. Retrieved August 29, 2010.
- on YouTube
- Litaer, Lieven (October 10, 2013). "Okrand about Into Darkness".
- Rogers, Tony (March 7, 2011). "ghom tlhIngan Hol lujatlhbogh ghotpu': Translation: People who speak Klingon meet". Arbiter Online: Boise State's Independent Student Media.
- Bo Yeon Kim Message on Twitter of 7 January 2019.
- Kelpien Language Consultant: Marc Okrand in the end credits of the episode "The Brightest Star"