Osamu Nagayama

is a Japanese businessman. He was the chairman and chief executive officer of Chugai Pharmaceutical Co., one of Japan's largest drug companies.

In July 2020, Nagayama was announced as the new chairman of Japanese electronics company Toshiba. In June 2021, Nagayama was ousted from his position as chairman of Toshiba following a shareholder revolt.

Nagayama is Japanese.

Nagayama is a member of the board of directors of the International Centre for Missing & Exploited Children (ICMEC), a global nonprofit organization that combats child sexual exploitation, child pornography, and child abduction.