The Japan national football team (サッカー日本代表, Sakkā Nihon Daihyō or Sakkā Nippon Daihyō), also known by the nickname Samurai Blue (サムライ・ブルー, Samurai Burū), represents Japan in men's international football. It is controlled by the Japan Football Association (JFA), the governing body for football in Japan.

Prior to the late 1980s, Japan's national football team was largely amateur, with the sport less popular domestically than baseball or sumo. Since the early 1990s, following the full professionalization of the sport, Japan has emerged as one of Asia's leading teams. The national team has qualified for every FIFA World Cup since 1998 (including an automatic berth as co-hosts of the 2002 tournament alongside South Korea), advancing to the knockout stage in 2002, 2010, 2018, and 2022. Japan has also won a record four Asian Cup titles, in 1992, 2000, 2004, and 2011. In addition, the team finished as runners-up in both the 2001 FIFA Confederations Cup and the 2019 Asian Cup. Japan is one of only three teams from the Asian Football Confederation (AFC) to have reached the final of a senior FIFA men's competition, alongside Australia and Saudi Arabia.

Japan's progression in a short period has served as an inspiration and example of how to develop football. Their principal continental rivals are South Korea and, most recently, Australia; they also developed rivalries against Iran and Saudi Arabia.

Japan was the first team from outside the Americas to participate in the Copa América, having been invited in the 1999, 2011, 2015, and 2019 editions of the tournament, although they only played in the 1999 and 2019 events.

As of October 2024, Japan is the highest-ranked AFC team at 15th, and has been since December 2022.