Gunma 3rd district was a constituency of the House of Representatives in the Diet of Japan (national legislature). Between 1947 and 1993 it elected four representatives by single non-transferable vote. As of 1993, it comprised the cities of Takasaki, Shibukawa, Fujioka, Tomioka, Annaka and the Gunma, Kitagunma, Tano, Kanra, Usui and Agatsuma districts.
The district was a traditional "conservative kingdom" (hoshu-ōkoku), a stronghold of the Liberal Democratic Party (LDP) and its predecessors. It was, most notably, represented by several faction leaders and later prime ministers:
With only two exceptions Gunma's 3rd district was represented by three conservatives and one candidate from the Japan Socialist Party (JSP). Tsuruo Yamaguchi, in the 1980s JSP secretary-general, was elected eleven times between 1960 and 1993, never receiving the most votes and ranking second only once in 1990.