2011 US Open – Boys' singles

Jack Sock was the defending champion, but participated in the men's main draw, as he was ineligible to defend his title.

Oliver Golding claimed the title by defeating Jiří Veselý 5–7, 6–3, 6–4 in the final.

Seeds
• # 🇨🇿 Jiří Veselý (final)

• # 🇦🇺 Luke Saville (first round)

• # 🇺🇸 Bjorn Fratangelo (third round)

• # 🇧🇴 Hugo Dellien (third round)

• # 🇧🇷 Thiago Moura Monteiro (first round)

• # 🇸🇰 Filip Horanský (quarterfinals)

• # 🇦🇹 Dominic Thiem (first round)

• # Mate Pavić (first round)

• # 🇬🇧 Liam Broady (third round)

• # 🇬🇧 George Morgan (semifinals)

• # 🇦🇺 Andrew Whittington (first round)

• # 🇦🇹 Patrick Ofner (first round)

• # 🇬🇧 Oliver Golding (champion)

• # 🇧🇷 João Pedro Sorgi (second round)

• # Matías Sborowitz (second round)

• # Jeson Patrombon (first round)