Mister

Mister was a moderately formal title used in addressing an individual, most typically a male. Abbreviated as "Mr." and 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).

One such example of the term used alone to address an individual was by Captain James T. Kirk in 2266 on board the USS Enterprise (NCC-1701). During a conference with several crew members, Lieutenant Stiles 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." 

The President of the Federation was properly addressed as "Mister President." 

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

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

The term "Mister" was properly used to a variety of civilian individuals, such as:
 * Mister Garak
 * Mister Neelix

Starfleet misters
In Starfleet, 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. 

Occassionally, women were referred to as "Mister":
 * In 2266, Robert Tomlinson referred to Angela Martine jokingly as "Mister" after she did the same to him.
 * In 2285, Lieutenant Saavik was addressed as "Mister" by Admiral Kirk and Captain Spock.

A Starfleet captain was not generally referred to as "mister." Jean-Luc Picard did not mind being mistakenly called "Mister Picard" by Professor Richard Galen in 2368. Captain Willard Decker was referred to as "Mister Decker" after being temporarily reduced in rank to Commander in 2273. 

Other notable Misters

 * The following were seen to be called "Mister," usually on numerous or notable occassions.


 * Mister Branson
 * Mister Chekov
 * Mister Crusher
 * Mister Data
 * Mister Fields
 * Mister Kaplan
 * Mister Kyle
 * Mister La Forge
 * Mister Leslie
 * Mister O'Brien
 * Mister Paris
 * Mister Preston
 * Mister Scott
 * Mister Spock
 * Mister Sulu
 * Mister Tuvok
 * Mister Whalen
 * Mister Worf