Junko Hosoe is a Japanese former jockey and horse racing commentator who is known for voicing a fictionalized version of herself in the Uma Musume Pretty Derby franchise. Her appearance in the series is a unique case where a real-life personality from the world of horse racing provides the voice for her own character.

Before her involvement in anime, Hosoe had a pioneering career in horse racing. Born in 1975, she became one of the first female jockeys in the history of the Japan Racing Association. She made her debut in 1996 and rode in 493 races, achieving 14 wins before retiring in 2001 due to health issues. Following her retirement as a jockey, she transitioned to a career as a horse racing commentator and critic, bringing her firsthand experience to broadcasts.

Hosoe's connection to the Uma Musume Pretty Derby series stems directly from her professional background. She lends her voice to the character Hosoe-san, a race commentator within the anime's world, a role that mirrors her real-life occupation. This casting allows the series to feature an authentic voice in its racing scenes. Her character appears in the main anime series and in the spin-off series Umayuru. While Hosoe-san is a recurring character, Junko Hosoe's voice acting work is almost entirely contained within this single franchise, based on available information.