Masako Ōkawara
大河原 雅子
Ōkawara in 2024
Member of the House of Representatives
In office 27 October 2017 – 23 January 2026
Preceded by	Multi-member district
Succeeded by	Kiyoshi Odawara
Constituency	Northern Kanto PR (2017–2021) Tokyo PR (2021–2024) Tokyo 21st (2024–2026)
Member of the House of Councillors
In office 29 July 2007 – 28 July 2013
Preceded by	Yasuo Ogata
Succeeded by	Yoshiko Kira
Constituency	Tokyo at-large
Member of the Tokyo Metropolitan Assembly
In office 1999–2005
Constituency	Setagaya Ward
In office 1993–1997
Constituency	Setagaya Ward
Personal details
Born	(1953-04-08) 8 April 1953 (age 72) Yokohama, Kanagawa, Japan
Party	CDP (since 2017)
Other political affiliations	TSN (1993–2007) DPJ (2007–2013; 2014–2016) Independent (2013–2014) DP (2016–2017)
Alma mater	International Christian University
Website	Official website

Masako Ōkawara (大河原 雅子; born 8 April 1953) is a Japanese politician of the Constitutional Democratic Party and a former member of the House of Representatives in the Diet (national legislature). A native of Yokohama in Kanagawa Prefecture and 1977 graduate of International Christian University, she had served in the assembly of Tokyo for three terms (10 years) since 1993. She was a member of the House of Councillors between 2007 and 2013.

• 政治家情報 〜大河原 雅子〜. ザ･選挙 (in Japanese). JANJAN. Retrieved 25 October 2007.

• Official website in Japanese.