| Masayuki Naoshima | |
| Native Name Lang: | ja |
| Office: | Minister of Economy, Trade and Industry |
| Primeminister: | Yukio Hatoyama Naoto Kan |
| Term Start: | 16 September 2009 |
| Term End: | 17 September 2010 |
| Predecessor: | Toshihiro Nikai |
| Successor: | Akihiro Ohata |
| Office2: | Member of the House of Councillors |
| Term Start2: | 26 July 1992 |
| Term End2: | 25 July 2016 |
| Constituency2: | House of Councillors proportional district |
| Birth Date: | 23 October 1945 |
| Birth Place: | Ikeda, Osaka, Japan |
| Alma Mater: | Kobe University |
| Party: | DPP |
| Otherparty: | DSP New Frontier Party New Fraternity Party DPJ DP |
is a Japanese politician of the Democratic Party of Japan, a member of the House of Councillors in the Diet (national legislature). A native of Ikeda, Osaka and graduate of Kobe University, he was elected for the first time in 1992 and served until the 2016 Japanese House of Councillors election. Before becoming a politician, he worked for Toyota and its union for a long time.