The 1976 Japan Open Tennis Championships was a tennis tournament played on hard courts and part of the 1976 Commercial Union Assurance Grand Prix circuit. It was the fourth edition of the event and took place in Tokyo, Japan. The tournament was held from November 1 through November 7, 1976. First-seeded Roscoe Tanner won the singles title.[1]
Roscoe Tanner defeated 
Corrado Barazzutti 6–3, 6–2
Bob Carmichael / Ken Rosewall defeated 
Ismail El Shafei / 
Brian Fairlie 6–4, 6–4