| Jin Murai | |
| Native Name Lang: | ja |
| Office: | Governor of Nagano Prefecture |
| Term Start: | 1 September 2006 |
| Term End: | 31 August 2010 |
| Alma Mater: | University of Tokyo |
| Predecessor: | Yasuo Tanaka |
| Successor: | Shuichi Abe |
| Office2: | House of Representatives |
| Constituency2: | National Proportional Representation Block |
| Term Start2: | November 2003 |
| Term End2: | 8 August 2005 |
| Office3: | House of Representatives |
| Constituency3: | Nagano No.2 district |
| Term Start3: | October 1996 |
| Term End3: | November 2003 |
| Predecessor3: | (district created) |
| Successor3: | Mitsu Shimojo |
| Office4: | House of Representatives |
| Constituency4: | Nagano No.2 district |
| Term Start4: | 8 July 1986 |
| Term End4: | October 1996 |
| Predecessor4: | Dai Shiojima |
| Successor4: | (district abolished) |
| Birth Date: | 28 March 1937 |
| Birth Place: | Matsumoto, Nagano, Japan |
| Party: | Liberal Democratic Party Japan Renewal Party New Frontier Party |
is a former governor of Nagano Prefecture in Japan. After growing up in Matsumoto, Nagano, he graduated from the University of Tokyo in 1959 and entered the Ministry of International Trade and Industry upon graduation. In 1986 he was elected to the House of Representatives in the Diet (national legislature) for the first time. He served six consecutive terms as a member for Nagano No.4 district (1986–1996), Nagano No.2 district (1996–2003) and the national proportional representation block (2003–2005).
Whilst in the Diet he served in various ministerial roles, including as Minister of State for Food Safety, Minister of State for Disaster Management and Chairman of the National Public Safety Commission. In July 2005 he voted against the government's postal reform legislation and subsequently lost the support of the Liberal Democratic Party. He did not nominate to contest the September 2005 general election. In the following year he was elected governor of Nagano Prefecture and served one term.