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")

Giotto was played by actor Barry Russo, who also played Commodore Robert Wesley. In a common mistake made on costume insignia during TOS Season 1, Giotto was referred to as "lieutenant commander," yet wore the braid of a full commander. This mistake was also made on Spock and Benjamin Finney's uniforms.
The novels Wagon Train to the Stars, From History's Shadow, and Purgatory's Key give him the first name "Barry". The novel A Choice of Catastrophes gives him the first name "Salvatore". The novel Past Prologue gives him the first name "Antonio".

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