Hajime Hosogai is a Japanese footballer. He is a flexible player, able to play in his natural role as defender, defensive midfielder, and plays for Bundesliga side Bayer 04 Leverkusen.

Hosogai was amongst the most promising players of Urawa Red Diamonds. Having helped the Red Diamonds to the AFC Champions League in 2007, he played for Urawa at the 2007 FIFA Club World Cup. On 23 December 2010, he left Japan and transferred to the German club Bayer 04 Leverkusen, who promptly loaned him out to FC Augsburg. On 9 September 2011, he scored his first Bundesliga goal against Leverkusen. Playing for the newly promoted Bavarian club, Hosogai helped avoiding relegation before returning to Bayer Leverkusen for the 2012–13 season.