Keita Inagaki (稲垣 啓太, Inagaki Keita, born 2 June 1990) is a Japanese professional rugby union player who plays as a prop for Japan Rugby League One club Saitama Wild Knights and the Japan national team.

[6] Such was his impact in his first two seasons as a professional that when injuries struck the Melbourne Rebels two Japanese players Shota Horie and Male Sa'u, Inagaki was signed up as a concessional signing on a one-year deal ahead of the 2015 Super Rugby season.

His official test debut came against Romania in Bucharest on 15 November 2014 and he won his second cap a week later against Georgia in Tbilisi.

[8] Japan finished the 2015 World Cup with 3 wins out of 5 games but failed to reach the quarterfinals.

Inagaki helped Japan reach their first ever quarterfinals where they went on to lose to eventual winners South Africa 26–3.