Manabu Horii (堀井 学, Horii Manabu) (born February 19, 1972) is a former Japanese politician and speed skater.

Horii represented Noboribetsu in the Hokkaido Legislative Assembly for the Liberal Democratic Party (LDP) from 2007 to 2012.

In the 2012 general election of the House of Representatives, he was elected the as LDP candidate in Hokkaido 9th district seeking to succeed retiring Democrat Yukio Hatoyama.

He was nominated in July 2012 when Hatoyama was still expected to run for re-election.

On 28 August 2024, Horii resigned from the House of Representatives following a scandal over his giving out condolence money to constituents for funerals he did not personally attend in violation of election laws.