A protocol officer was a crewmember aboard Starfleet vessels in the 22nd century responsible for ensuring that the various rules and regulations aboard ship were known and followed.

Aboard the Enterprise NX-01, communications officer Hoshi Sato fulfilled this role. In 2154, Captain Archer informed Navaar, an Orion slave girl whom had been brought onboard, that Sato would discussing ship's operations with her. (ENT: "Bound")