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Iwate 3rd district is a constituency of the House of Representatives in the Diet of Japan (national legislature). It is located in Iwate.
Ichirō Ozawa of the Liberal Party took the seat in the constituency after his original seat in the Iwate 4th district was abolished in the 2017 general election. Previously, the seat was held by Toru Kikawada of the Democratic Party (DPJ) since 2000.
Located in Southwestern Iwate, the district includes the entire abolished 4th district. Only Ichinoseki City and Hiraizumi Town were retained in the 3rd after the 2017 redistricting, other municipalities were transferred to the Iwate 2nd district.