For additional meanings of "Mayweather", please see Mayweather.

Captain Mayweather was the Earth Cargo Service commanding officer of the ECS Horizon. With his wife, Rianna Mayweather, he was the father of Paul and Travis Mayweather and a daughter.

When Mayweather assumed command of the Horizon, he was a year younger than his son Paul Mayweather was in 2153. Prior to assuming command, he was an engineer. Because of his inexperience and not knowing how to run the bridge, the Horizon fell behind schedule. Facing the loss of his ECA license, he wanted to quit. His wife Rianna would not let him quit. He eventually went on to have a long successful career as the captain of the Horizon. (ENT: "Horizon")

At some point, he visited Neubilia Prime, where the elders challenged him to a duel and he won. He died while Travis was serving on Enterprise NX-01. (ENT: "Fortunate Son", "Horizon")

At one time Travis and his father were aboard a vessel, cramped in a small room, when the power generator, grav-plating, and life support went offline. Travis was able to see the bad situation in his father's eyes. (ENT: "The Catwalk")

This character was only mentioned in dialogue.
The Pocket ENT novel Rosetta gives his name as Paul Mayweather, Sr.