, is a Japanese actor. He has appeared in more than 30 films since 2008. Nagayama has two elder brothers who are also actors: Tatsuya and Eita Nagayama.
On 17 May 2016, Nagayama and actress Hikari Mitsushima briefly dated, which was confirmed by their respective agencies.
On 16 June 2023 he was arrested for suspicion of violating the Cannabis Control Law in his apartment in Meguro. According to early reports, investigators from the Metropolitan Police Department stepped into his residence on 15 June, concluding with Nagayama's arrest after midnight on the 16th for possession of marijuana.