2011 All Japan Indoor Tennis Championships – Singles

Yuichi Sugita was the defending champion after defeating Matthew Ebden in the 2010 final. He was eliminated by Cedrik-Marcel Stebe already in the first round.

Stebe reached the final, but lost to Dominik Meffert 6–4, 4–6, 2–6.

Seeds
• # 🇯🇵 Go Soeda (semifinals)

• # 🇩🇪 Matthias Bachinger (quarterfinals)

• # 🇯🇵 Tatsuma Ito (quarterfinals)

• # 🇯🇵 Yuichi Sugita (first round)

• # 🇩🇪 Dominik Meffert (champion)

• # 🇩🇪 Sebastian Rieschick (quarterfinals)

• # 🇩🇪 Simon Stadler (semifinals)

• # 🇩🇪 Andre Begemann (quarterfinals)