Kagawa 1st district (香川県第1区, Kagawa-ken dai-i-ku) is an electoral district in the House of Representatives of Japan.

The district was established in 1994 as a single-member constituency.

The current representative for the district is Junya Ogawa, a member of the CDP as well as former representative for the district from 2009 to 2012 as a member of the DPJ.

Ogawa was previously a member of the Shikoku proportional representation district from 2005 to 2009, and then again from 2012 to 2021.

After the rezoning applied in 2022, the areas covered by this district are as follows:[2] After the 2017 redistricting, the areas covered by this district were as follows:[3] After the 2013 redistricting, the areas covered by the district were as follows:[4] From 1994 to the first rezoning in 2013, the areas covered by the district were as follows:[5] ‡ - Also ran in Shikoku PR district ‡‡ - Ran and won in the Shikoku PR district