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Mitsubishi UFJ Securities Co., Ltd. (三菱UFJ証券株式会社, Mitsubishi UFJ Shōken Kabushiki Kaisha) is the investment banking arm of the Mitsubishi UFJ Financial Group (MUFG), a financial services company which is the largest in Japan measured by assets. The company is headquartered in Tokyo, Japan.

The company was established on October 1, 2005, when the firm's parent company, Mitsubishi UFJ Financial Group, was formed by the merger of Mitsubishi Tokyo Financial Group (MTFG) and UFJ Holdings. On the same day, the respective investment banking subsidiaries of MTFG and UFJ, Mitsubishi Securities Co., Ltd.(established in March 1948) and UFJ Tsubasa Securities Co., Ltd.(established in April 1948), were merged to form Mitsubishi UFJ Securities Co., Ltd.

The international Chief Risk Officer is Oliver Jakob.