Yasuji Oshima (大島 康次, 1884–1961) was a prominent Japanese electrical engineer and industrialist who made significant contributions to the development of Japan's electrical infrastructure, particularly in the field of railway electrification during the early 20th century.
Born in 1884, Oshima graduated from the Faculty of Engineering at the Imperial University of Tokyo (now the University of Tokyo). He joined the Ministry of Railways (鉄道省, Tetsudōshō) where he played a crucial role in planning and implementing the electrification of major railway lines. His work was instrumental in advancing the efficiency and capacity of Japan's national railway system.
After his career with the Ministry of Railways, Oshima transitioned to the private sector, taking on leadership roles in key Japanese companies. He served as a director at Fuji Electric Co., Ltd. (富士電機株式会社, Fuji Denki Kabushiki Kaisha) and later as an executive at Tokyo Electric Power Company (東京電力株式会社, Tōkyō Denryoku Kabushiki Kaisha), contributing to the expansion and modernization of Japan's power generation and distribution networks.
Oshima's efforts were pivotal in laying the groundwork for Japan's modern industrial and transportation systems, reflecting the nation's rapid technological adoption and development in the pre- and post-World War II eras. He passed away in 1961.