First contact procedure or protocol was a standard set of rules and guidelines governing the steps one should take upon making first contact with a race or culture. It was also one of the major components of the bridge officer's test.
In 2256, Michael Burnham noted that first contact protocol restricted the away team from borrowing or altering the property of the Pahvans "without them understanding [Starfleet's] objective and agreeing to it." (DIS: "Si Vis Pacem, Para Bellum")
Also that year, Ambassador Vadosia requested to be present when information from a Gamma Quadrant probe was downloaded, as he had a particular interest in first contact procedures and suggested that the probe might be a first contact with a new species. (DS9: "The Forsaken")
In 2370, Lieutenant Commander Deanna Troi, while undertaking the bridge officer's test in order to be promoted to commander, passed the first contact procedure section under the supervision of Commander William T. Riker. (TNG: "Thine Own Self")