Matasaburō Watanabe (渡辺 又三郎 Watanabe Matasaburō; 1850 - 1910) was a Japanese politician.
He lived in Hiroshima Prefecture, and served as Vice President of the Hiroshima Lawyers' Club. Was also among the owners of Chugoku Shimbun. Served as Mayor of Hiroshima from September 9, 1909 to July 3, 1910.