Shōgo Arai (荒井 正吾, Arai Shōgo, born 18 January 1945 in Yao, Osaka) is a Japanese politician and a former governor of Nara Prefecture in Japan.

He attended the Maxwell School of Citizenship and Public Affairs Syracuse University as a ministry official.

Leaving the ministry in 2001, he was elected to the House of Councillors in the Diet of Japan (national legislature) for the first time in the same year.

He served in that body until 2007, when he was elected Governor of Nara Prefecture.

Arai served as Nara’s Governor from 2007 until 2023 when he was succeeded by Makoto Yamashita.