Ōita 1st District (大分県第1区, Ōita-ken dai-i-ku) is an electoral district in the Japanese House of Representatives.

The district was established as a single-member constituency in 1994 from parts of the original 1st district.

As of 5 January 2023, the areas covered by this district are as follows: Before the 2013 redistricting, the area covered by the district were as follows:[2] ‡ - Also ran in the Kyushu PR district ‡‡ - Also ran and won a seat in the Kyushu PR district