Monarch Motor Co., Ltd., produced in Japan from 1952 to 1962, was a motorcycle manufacturer based in Tokyo founded by Fujio Murata, a former Meguro employee. The company became known for four-stroke OHV motorcycles such as the Pony Monarch, M3 250, and SP1 250, many of which were initially powered by Meguro-derived engines and heavily influenced by British motorcycles from Velocette and Norton. Monarch gained recognition through successful participation in Japanese racing and hill-climb events during the 1950s. Characterized by large-displacement single-cylinder engines, British-inspired engineering, and limited production, the company ceased operations in 1962 during the consolidation of the Japanese motorcycle industry.