Masahiro Miki (; born 26 July 1955) is a Japanese billionaire businessman, and the founder and largest shareholder of Tokyo-based shoemaker ABC-Mart. Miki is of Korean descent.
In 1985, Miki founded shoe and apparel company Kokusai Boeki Shoji. The company was renamed ABC-Mart in 1990 and went public in 2002. Miki acted as chairman of the company from 2004 to 2007.
As of November 2025, Miki has an estimated net worth of $3.9 billion.
In addition to his business, Miki is also a successful racehorse owner, who owns several notable horses including Justin Milano (2024 Satsuki Shà Â) and Justin Palace (2024 Spring Tenno Sho).