The Conservative Party of Japan is a conservative, Japanese nationalist and right-wing populist political party in Japan founded by novelist Naoki Hyakuta and journalist Kaori Arimoto in 2023, following the passage of the LGBT Understanding Promotion Act. The party, claiming to "protect Japan's national polity and traditional culture" is often characterised as being opposed to immigration, xenophobic, and uses historically revisionist rhetoric, with party leaders often engaging in discriminatory remarks towards foreigners and sexual minorities, as well as denying Japanese war crimes committed prior to and during the Second World War, such as the Nanjing Massacre.

Naoki Hyakuta is a Japanese former novelist, television producer and politician who is the co-founder and leader of the Conservative Party of Japan. He is known for his right-wing political views and denying Japanese war crimes prior to and during World War II. He is particularly known for his 2006 novel The Eternal Zero, which became a popular 2013 film, his controversial period as a governor of government broadcaster NHK, as well as his support of Nanjing Massacre denial.