Lieutenant Commander Giotto was a male Human Starfleet officer in the 23rd century. He served in the operations division aboard the USS Enterprise in 2267 under the command of Captain James T. Kirk, during the historic five-year mission. He was one of the ship's security officers.
That same year, assisting Captain Kirk and Commander Spock, Giotto assembled security troops and armed them with type 2 phasers. His detail was assigned the task of searching for a creature that had been attacking the colony on Janus VI and had killed fifty-one miners. (TOS: "The Devil in the Dark")