Masatada Tsuchiya (土屋 正忠, Tsuchiya Masatada) is a former Japanese lawmaker from the Liberal Democratic Party who lost his single member district seat in the House of Representatives to Constitutional Democratic Party of Japan member Kan Naoto in the October 2017 general election by 1,046 votes.

Tsuchiya entered national politics after resigning from his position as mayor of Musashino, Tokyo in 2005 to run against the then Deputy President of the Democratic Party of Japan, Kan, for the House of Representatives seat in the Tokyo 18th district. Although Tsuchiya lost in the run-off, he was still elected under the party-list proportional representation system. Kan and Tsuchiya have since continued to face off in House of Representatives elections, with Kan holding on to the single member district seat through the 2009 general election, and Tsuchiya capturing the single member district seat in the 2012 general election and the 2014 general election.

In the October 2017 general election, Tsuchiya was unable to secure a seat in the House of Representatives under the party-list proportional representation system due to a rule within the Liberal Democratic Party limiting party-list proportional representation candidates to those aged 73 or under. Tsuchiya was 75 at the time he ran in the October 2017 general election.

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House of Representatives (Japan)
Preceded by
N/A
Member of the House of Representatives from
Tokyo PR block

2005–2009
Succeeded by
N/A
Preceded by Member of the House of Representatives from
Tokyo 18th district (single-member)

2012–2017
Succeeded by
Political offices
Preceded by
Masanobu Fujimoto
Mayor of Musashino
1983–2005
Succeeded by
Morimasa Murakami
Preceded by
Kazuo Yoshino
(Mayor of Fuchū)
Chairman of the conference of Tokyo's city mayors
1996–1998
Succeeded by
Chiaki Usui
(Mayor of Tama)