Shigeo Nagashima Invitational Sega Sammy Cup

The Shigeo Nagashima Invitational Sega Sammy Cup (長嶋茂雄Invitational セガサミーカップゴルフトーナメント) is a professional golf tournament on the Japan Golf Tour. It has been played annually at The North Country Golf Club near Chitose, Hokkaido since 2005.

The tournament typically took place during the first week of July, but since 2019 it has been played in late August. The course measures 7,178 yards and the par was 72. In 2019, the purse was ¥150,000,000, with ¥30,000,000 going to the winner.

Shunsuke Sonoda set the tournament record in 2013, shooting −20 (268) a score subsequently equalled by Ryo Ishikawa in 2019.