The Racehorse Owner is a supporting character in the anime Neko Jockey. He owns Mannenbilly, a well-bred thoroughbred with an excellent physique and bloodline who cannot seem to win, having compiled a long run of consecutive losses. Hoping to make his horse a first-class racer, he takes an unorthodox approach and brings a cat into the stable as the horse's new jockey, a decision that sets the central situation of the story in motion. Alongside the horse trainer, his own daughter, and the cat jockey, he pursues the goal of winning a GI race.

The owner's personality is marked by eccentricity and unconventional thinking. Instead of sticking to traditional methods, he is willing to place his trust in a jockey who appears, to everyone else, to be an ordinary cat. His enthusiasm for this unusual plan contrasts with the more grounded and hard-working attitude of the trainer, who is left to handle the day-to-day care of the horse.

In the story, the owner acts mainly as the decision-maker who gives the stable its strange direction. He is also the father of a daughter who is in a rebellious phase; she joins the stable as new staff, spends much of her time on her phone, and frequently talks back to him. His relationship with the trainer is a working partnership centered on improving Mannenbilly, while his relationship with the cat jockey is tied to their shared ambition to return the horse to winning form. The group also faces rivals in pursuit of victory, most notably the rider Umao Umanori.

The series does not dwell on the owner's personal history or grant him special abilities; he is defined instead by his eccentric judgment and his willingness to take a chance on an unorthodox jockey. His importance to the story comes from the fact that his unusual hiring decision is what gives the cat jockey the opportunity to race.