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")

During his time as captain of the Horizon, he had a run-in with Nausicaans and barely survived. Captain Mayweather expected his son Travis to take over as commanding officer aboard the Horizon. He was unhappy when Travis left to serve aboard Enterprise but respected his decision. (ENT: "Fortunate Son")

Sometime during the mid-22nd century, the Horizon ran into a class 3 neutronic storm. According to Travis Mayweather, the crew took shelter in the ship's core for six weeks, and during that time, the ship's power generators went down, and they lost the grav-plating and life support. Travis was able to see the bad situation in his father's eyes. (ENT: "The Catwalk")

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: "Horizon")

Travis once promised him that he would see the Terra Nova colony – what he did in 2151. (ENT: "Terra Nova")

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