Katsudon is a popular Japanese food, a bowl of rice topped with a deep-fried pork cutlet, egg, and condiments. Variations include sauce katsudon (with Worcestershire sauce), demi katsudon (with demi-glace and often green peas, a specialty of Okayama), shio-katsudon (with salt, another Okayama variety), shošyu-dare katsudon (with soy sauce, Niigata style), and miso-katsudon (a favorite in Nagoya). Beef (gyu-katsu) and chicken (oyakodon) can substitute for the pork.
The dish takes its name from the Japanese words tonkatsu (for pork cutlet) and donburi (for rice bowl dish).
It has become a modern ritual tradition for Japanese students to eat katsudon the night before taking a major test or school entrance exam. This is because "katsu" is a homophone of the verb katsu, meaning "to win" or "to be victorious".