| Masako Ōkawara | |
| Office: | Member of the House of Representatives |
| Term Start: | 27 October 2017 |
| Constituency: | Kita-Kantō PR |
| Office1: | Member of the House of Councillors |
| Term Start1: | 29 July 2007 |
| Term End1: | 28 July 2013 |
| Constituency1: | Tokyo |
| Office2: | Member of the Tokyo Metropolitan Assembly |
| Term Start2: | 1999 |
| Term End2: | 2005 |
| Constituency2: | Setagaya |
| Term Start3: | 1993 |
| Term End3: | 1997 |
| Constituency3: | Setagaya |
| Birth Date: | 8 April 1953 |
| Birth Place: | Yokohama, Kanagawa, Japan |
| Party: | CDP |
| Otherparty: |
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| Alma Mater: | International Christian University |
| Website: | Official website |
is a Japanese politician of the Constitutional Democratic Party and a 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.