Commodore Barstow was a male Human Starfleet flag officer in the 23rd century. He served in the command division in 2267.
That same year, Barstow communicated with Captain James Kirk aboard the USS Enterprise, to confer about the galaxy-wide magnetic effect which had been centered on an uncharted iron-silica planet which the Enterprise had been investigating. Barstow and Kirk agreed that the effect might signal a threat of invasion, and Barstow informed Kirk that he had ordered the withdrawal of all Starfleet units and personnel within one hundred parsecs of the planet, while simultaneously ordering Kirk to continue the investigation. (TOS: "The Alternative Factor")