Mie 3rd district (三重県第3区, Mie-ken dai-san-ku or simply 三重3区, Mie-san-ku) is a single-member constituency of the House of Representatives in the Diet of Japan.

It covers Northern parts of Mie Prefecture.

In 2012, 339,451 eligible voters were registered in the district.

[2] The only representative for the 3rd district since its creation has been Katsuya Okada who had represented the pre-reform Mie 1st district that had elected five representatives by single non-transferable vote and covered roughly the present single-member districts Mie 1, 2 and 3.

Okada was the president of the DPJ from 2004 to 2005.