Jefferies

The name Jefferies could refer to the following;

Individuals

 * George William Jefferies - an engineer and Captain in the United Earth Starfleet in the mid 22nd century.
 * Benjamin McDonald-Jefferies - the son of George William Jefferies, he was a civilian engineer.
 * Frederick William Jefferies - the son of Benjamin McDonald-Jefferies, he was a Starfleet engineer who was most notable for designing the Jefferies tubes.

Ships

 * USS Jefferies - a starship in service in the 24th century.

Engineering

 * Jefferies tubes, or Jefferies tube - a network of service tubes found on Federation vessels that enabled rapid access to ships systems.