Okano Keijirō (岡野 敬次郎, 21 September 1865 – 23 December 1925) was a legal scholar, a politician and cabinet minister in the pre-war Empire of Japan.

Okano was a native of Kōzuke Province (modern-day Gunma Prefecture).

He became professor of Tokyo Imperial University (See Keijirō Okano [:ja:]).

He worked as a bureaucrat at various cabinet ministries in the Meiji government, and was appointed to a seat in the Upper House of the Diet of Japan in 1908.

In October 1925, Okano was appointed to Vice-President of the Privy Council, and was awarded the title of baron (danshaku) in the kazoku peerage.