Okada Shinichirō (岡田信一郎) (20 November 1883 – 4 April 1932) was a prominent Japanese architect who practiced in the early twentieth century.

[1][2] Okada taught at Waseda University and Tokyo School of Fine Arts.

He graduated from Daiichi High School in 1903 and entered the Tokyo Institute of Technology Technical University.

Okada won the first prize in a design competition for the Osaka City Central Public Hall in 1917.

[3] He designed the Tokyo Metropolitan Art Museum, a European classicist building with entrances on all four sides, which opened on 1 May 1926.