The 2010–11 Top League was the eighth season of Japan's domestic rugby union competition, the Top League. The Sanyo Wild Knights defeated Suntory Sungoliath 28-23 in the final of the Microsoft Cup to claim their first Top League title.

The Top League is a semi-professional competition which is at the top of the national league system in Japan, with promotion and relegation between the next level down.

Top 4 sides of the regular season competed in the Microsoft Cup (2011) knock out tournament to fight for the Top League title. The top 4 teams of 2008–09 were Toshiba Brave Lupus, Sanyo Wild Knights, Toyota Verblitz and Suntory Sungoliath.

The two second round winners qualified for the All-Japan Rugby Football Championship.

The Top League teams ranked 7th and 10th played-off for the right to meet the Top League team ranked 5th in the second round. The Top League teams ranked 8th and 9th played-off for the right to meet the Top League team ranked 6th in the second round.

So Sanix and Ricoh progressed to the second round.

The Top League team ranked 5th played-off against the winner of the teams ranked 7th and 10th, and the Top League team ranked 6th played-off against the winner of the teams ranked 8th and 9th. The two winning second round teams advanced to the All-Japan Rugby Football Championship.

So Kobelco and NEC advanced to the All-Japan Rugby Football Championship.