Computer voice
The computer voice was an audio interface program designed to allow computers to express information verbally. Many space-faring cultures, such as the United Federation of Planets, the Romulan Star Empire and the Cardassian Union, equipped their computers with this feature.

200,000 years ago the Iconians equipped a facility launching Iconian probes on Iconia with a female computer voice. ()

Starfleet starships utilized computer voices by 2256, a feature which continued to be used throughout the 23rd and 24th century. (; )

The computer voice of the  was reprogrammed in 2267 on Cygnet XIV, with the intent of giving it a less mechanized personality. The resulting modifications caused the computer to address James T. Kirk in an increasingly amorous manner, as well as giggle. This modification was short-lived. ()

While most Starfleet computers utilized female voices, the M-5 multitronic unit in 2268 had a male voice. ()

In the alternate reality, the  had a male computer voice. ()

In the mirror universe, the  had a male computer voice. ()

After Bynar modifications to the  in 2364, the starship's computer for a short time used both the usual female and a male voice. ()

Starfleet environmental suits were also equipped with a computer voice. (; )

The 32nd century starship, owned by Cleveland Booker, had a male computer voice. ()

Appendices

Background information

The original computer voice 
The computer voice on most Federation starship and fixed installation computers was portrayed by Majel Barrett-Roddenberry since the early days of  (first appearing in ). The computer voice in TOS and  was very rhythmic and mechanical. 

Following TOS, Majel Barrett-Roddenberry continued to play Starfleet computers; however, it became a far more normal-sounding female voice. She continued the role on  (with the exception of some early episodes), ,  and . There is only a single word spoken by a computer voice in the entire run of ENT, which is when Majel Barrett's computer voice of the USS Defiant twice states, "Working…" in the episode . 

She further provided the computer voice in all of the TNG films, through the alternate reality reboot film . This  contribution was her final performance both as the computer voice and in a Star Trek project before her death.

Additional computer voice performers
Barbara Babcock, Beta 5 computer ()
Harve Bennett, USS Enterprise (NCC-1701) flight recorder ()
Kay Bess, La Sirena ()
Ursula Burton ()
Roxann Biggs-Dawson
Cardassian ATR-4107, reprogrammed ()
Automated repair station ()
Eugene Cordero, Sam Rutherford's cybernetic implant ()
Judi Durand
 ()
Deep Space 9 ()
Frank Force (pseudonym for Leonard Nimoy),  turbolift ()
Jenette Goldstein, USS Enterprise (NCC-1701) ()
Bonnie Gordon,  ()
Julianne Grossman,  ( onward)
Bill Hader,  ()
Doug Hale, USS Enterprise (NCC-1701) refit ()
Alex Kapp, USS Enterprise (NCC-1701) ()
Jessica McKenna
 ()
Sam Rutherford's cybernetic implant ()
Nichelle Nichols ()
Lennon Parham, simulator holopods ()
Loretta Shinosky,  ()
Fabio Tassone, Booker's ship ()
Kirk Thatcher,  memory test ()
Tasia Valenza
 ()
 ()
Teresa E. Victor, USS Enterprise (NCC-1701) (; )
Gillian Vigman, USS Cerritos miniature model ()
Marcy Vosburgh ()
Annabelle Wallis, USS Discoverys integrated lifeform, Zora (;  onward)
Colette Whitaker, Starbase 28 ()
John Winston,  ()
Lynnanne Zager,  ()

In addition to the names above, several unknown performers provided voices for various other computer systems, including:
Unknown actor
Bajoran transport ()
Cardassian ATR-4107, original ()
 ()
Haakona ()
Relva VII outpost ()
Starbase 173 ()

Unknown actress
Age-gauging device ()
Baran's mercenary ship ()
USS Cerritos, holodeck simulation ()
Iconian gateway ()
Relva VII outpost test computer ()

Trivia
When  first developed voice technology in real life, they named it "Majel" in honor of Majel Barrett. ()

Apocrypha 
In many of Activision's video game releases, Judi Durand voiced the Federation computer voice.

In the Star Trek: Legacies novel Captain to Captain, Captain Una Chin-Riley is momentarily distracted by hearing the Enterprises computer voice after many years, which was modeled after her own.

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