The 1971 Monte Carlo Open was a combined men's and women's tennis tournament played on outdoor clay courts at the Monte Carlo Country Club in Monte Carlo, Monaco . The men's tournament was part of the 1971 Pepsi-Cola Grand Prix circuit. It was the 65th edition of the event and was held from 5 April through 11 April 1971. Ilie Năstase and Gail Chanfreau won the singles titles.
Ilie Năstase defeated Tom Okker 3–6, 8–6, 6–1, 6–1
Gail Chanfreau defeated Betty Stöve 6–4, 4–6, 6–4
Ilie Năstase / Ion Țiriac defeated Tom Okker / Roger Taylor 1–6, 6–3, 6–3, 8–6
Katja Ebbinghaus / Betty Stöve defeated Lucia Bassi / Lea Pericoli 6–4, 6–3