| Yoshio Mochizuki | |
| Native Name Lang: | ja |
| Office: | Minister of Environment |
| Primeminister: | Shinzo Abe |
| Term Start: | 3 September 2014 |
| Term End: | 2 October 2015 |
| Predecessor: | Nobuteru Ishihara |
| Successor: | Tamayo Marukawa |
| Office1: | Member of the House of Representatives |
| Constituency1: | Tōkai PR (2011–2012) Shizuoka 4th (2012–2019) |
| Term Start1: | 24 January 2011 |
| Term End1: | 19 December 2019 |
| Predecessor1: | Multi-member district |
| Successor1: | Yōichi Fukazawa |
| Constituency2: | Shizuoka 4th |
| Term Start2: | 22 October 1996 |
| Term End2: | 21 July 2009 |
| Predecessor2: | Constituency established |
| Successor2: | Kenji Tamura |
| Office3: | Member of the Shizuoka Prefectural Assembly |
| Term Start3: | 1991 |
| Term End3: | 1996 |
| Office4: | Member of the Shimizu City Assembly |
| Term Start4: | 1975 |
| Term End4: | 1991 |
| Birth Date: | 2 May 1947 |
| Birth Place: | Shimizu, Shizuoka, Japan |
| Death Place: | Shimizu, Shizuoka, Japan |
| Party: | Liberal Democratic |
| Alma Mater: | Chuo University |
was a Japanese politician of the Liberal Democratic Party, a member of the House of Representatives in the Diet (national legislature), and a Minister of the Environment. A native of Shimizu, Shizuoka and graduate of Chuo University, he was elected to the first of his four terms in the city assembly of Shimizu in 1975 and to the first of his two terms in the assembly of Shizuoka Prefecture in 1991. He was elected to the House of Representatives for the first time in 1996 as an independent. He was affiliated to the openly revisionist organization Nippon Kaigi.[1]
Mochizuki died in office at the age of 72 on 19 December 2019.[2]