1971 Philadelphia International Indoor Open Championships – Men's singles

The 1971 Philadelphia International Indoor Open Championships – Men's singles was an event of the 1971 Philadelphia International Indoor Open Championships, tennis tournament played at the Spectrum in Philadelphia, Pennsylvania in the United States from February 9 through February 14, 1971. The draw comprised 32 players and 12 of them were seeded. First-seeded Rod Laver was the defending singles champion. Third-seeded John Newcombe won the title, defeating Laver 7–6(7–5), 7–6(7–1), 6–4 in the final.

Seeds
• # 🇦🇺 Rod Laver (final)

• # 🇦🇺 Ken Rosewall (first round)

• # 🇦🇺 John Newcombe (champion)

• # 🇦🇺 Tony Roche (second round)

• # 🇺🇸 Arthur Ashe (semifinals)

• # 🇦🇺 Roy Emerson (quarterfinals)

• # Tom Okker (quarterfinals)

• # 🇪🇸 Andrés Gimeno (second round)

• # 🇬🇧 Roger Taylor (second round)

• # 🇺🇸 Dennis Ralston (quarterfinals)

• # Nikola Pilić (second round, retired)

• # 🇦🇺 Fred Stolle (first round)