Mister
Mister – known in French as monsieur (for "my lord") or in Spanish as señor (for "sir"), and abbreviated as Mr. – was a moderately formal title used in addressing an individual, most typically a male. It was often combined with the individual's surname, it was usually used socially and implied either respect or a lack of an established social relationship (as when first meeting someone). In such a case, it was also often used when a person addressed another, whose name they did not know. (; ; ; ) 

The term "mister" was properly used to a variety of civilian individuals, such as: Mister Garak or Mister Neelix (; ) Prior to knowing what his occupation was, Tiron adressed Odo as mister. ()

The President of the Federation was properly addressed as "Mister President." () The Chairman of the Tal Shiar was properly addressed as "Mister Chairman". () The high advisor of Stratos was properly addressed as "Mister Advisor". ()

James T. Kirk referred to Charlie Evans as "Mister Evans". Evans, who was not raised by Humans and who lack the understand of many formalities, later asked Doctor Leonard McCoy "Why does he call me Mister Evans?" To which McCoy could only reply, "Because that's your name." ()

Neelix often referred to Tuvok as "Mister Vulcan," a result of a misunderstanding during their first meeting. ()

During the Dominion War in 2374, Jake Sisko approached Weyoun 5 addressing him as "Mister Weyoun". Weyoun responded, stating, "Oh, please. I prefer just Weyoun." ()

After his marriage to Deanna Troi, William T. Riker was jokingly referred to as "Mister Troi." ()

Use in service 
In Starfleet, adhering to old Earth naval tradition, it was also used sometimes in lieu of a more formal rank. This was generally done only when a superior officer addressed a subordinate, but it could also be used by subordinate-ranked individuals with superior officers when there was an established social relationship as well. ()

In line with the tradition, and formalized by Starfleet protocol, the moniker was also utilized in Starfleet by senior officers to address female subordinate officers, as was the case with  Saavik. () Not all Starfleet female officers were enamored with the naval tradition of using original male monikers for females as well, as Ensign Harry Kim discovered when he introduced himself to his new captain, Kathryn Janeway, using the correct moniker "sir" – the formal companion moniker of "mister", used when addressing a superior officer. Janeway made it clear that she preferred being addressed by rank, "Ensign, despite Starfleet protocol, I don't like being addressed as sir. (...) Ma'am is acceptable in a crunch, but I prefer Captain." () Counselor Deanna Troi on the other hand, half-jokingly admonished Data to address her henceforth as "sir", upon her promotion to commander. ()

Women in Starfleet referred to as "mister", included:
 In 2266, Angela Martine was jokingly referred to as "Mister" by Robert Tomlinson, after she did the same to him. ()
 In 2285, Lieutenant Saavik was addressed as "Mister" by Admiral Kirk and Captain Spock. ()

On some occasions, the term may be used alone to address an individual, as in an example given by Captain James T. Kirk in 2266 on board the . During a conference with several crew members, Lieutenant  became heated in protest to the lack of action being taken in pursuit of a Romulan Bird-of-Prey. After allowing Stiles to speak freely, Kirk calmly replied, "Sit down, mister." () Following the capture of Pavel Chekov, who was believed to have been a Russian spy discovered aboard the aircraft carrier  in 1986, he was warned by the interrogating FBI agent that "You play games with me, mister, and you're through." ()

A Starfleet captain was not generally referred to as "mister." Jean-Luc Picard did not mind being mistakenly called "Mister Picard" by Professor  in 2368. () Captain Will Decker was referred to as "Mister Decker" after being temporarily reduced in rank to commander in the 2270s. ()

 took note of Julian Bashir not like those from the Institute, as he recognized that Bashir was able to pass himself off as "normal", mockingly calling him "mister normal Starfleet man. Mister productive member of society," before suggesting that he and the others like him could "learn to be just like him. Wear little uniforms. Yes, sir. No, sir. Thank you, sir." ()

Individuals addressed as misters 
 Mister Archer
 Mister Arex
 Mister Baris
 Mister Bashir (prime) (aka Mister Merriweather; both only in Julian Bashir, Secret Agent)
 Mister  (mirror)
 Mister Bashir 
 Mister Bennings
 Mister Bokar
 Mister Branson
 Mister Chekov
 Mister Cing'ta
 Mister Clayton
 Mister Craig
 Mister Crusher (aka "young Mister Crusher", once by Riker)
 Mister Damar
 Mister 
 Mister Darvin (aka Mister Waddle)
 Mister Data
 Mister Depnen
 Mister Dokachin
 Mister Duchamps
 Mister Eddington
 Señor Eli
 Mister Falow
 Mister Fields
 Mister Fontaine
 Señor Frank
 Mister Fullerton
 Mister Garak (aka Mister Kamar)
 Monsieur Goulot
 Mister Hanok
 Mister Homn
 Mister Jakara
 Mister Johnson
 Mister 
 Mister Keeve
 Mister Klaang
 Mister Kolrami
 Mister Kovat
 Mister Kyle
 Mister La Forge
 Mister Lamonay S.
 Mister Leslie
 Mister Lorkin
 Mister MacReady
 Mister Markel
 Mister Mayweather
 Mister Morla
 Mister Mudd
 Mister Mullibok
 Mister Muniz
 Mister Nog
 Mister O'Brien
 Mister Odo
 Mister Pabst
 Mister Paris (aka "Monsieur Thomas")
 Mister Parton
 Mister Piersall
 Mister Pike
 Mister Plinn
 Mister Potts
 Mister Preston
 Mister Primmin
 Mister Quark
 Mister Reed 
 Mister Reed
 Mister Retaya
 Mister Riker
 Mister Rios 
 Mister Rom
 Mister Russell
 Mister Ryan 
 Mister Saavik
 Mister Sato
 Mister Scott
 Mister Shepard
 Mister Sisko (Benjamin, prime) (aka "young Mister Sisko", once by )
 Mister  (Benjamin, mirror)
 Mister Sisko (Jake) (aka "young Mister Sisko", once by Odo)
 Mister Sloan (aka Mister Greer)
 Mister Spock
 Mister 
 Mister 
 Mister Sulu
 Mister Tandro
 Mister 
 Mister Terev
 Mister Tholl
 Mister Tolar
 Mister Tosk
 Mister Tucker
 Mister Tulak
 Mister Tuvok 
 Mister Vaatrik
 Mister Valtane
 Mister Velik
 Mister Vup
 Mister Walking Bear
 Mister Webb
 Mister Weyoun
 Mister Whalen
 Mister 
 Mister Worf
 Mister Zayra
 Mister Zeemo
 Mister Zhaban

"Mister" Nicknames 
 "Mister Academy"
 "Mister Cube"
 "Mister Doom and Gloom"
 "Mister Ears"
 "Mister Hospitality"
 "Mister Klingon"
 "Mister Leisure Suit"
 "Mister Nice Guy"
 "Mister Personality"
 "Mister Pyramid"
 "Mister Regent"
 "Mister Starfleet"
 "Mister Tall and Popular"
 "Mister Tricorder"
 "Mister Vulcan"
 "Mister Whatever The Hell That Thing Is"
 "Mister Woof"

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Titles