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 Roquebrune-Cap-Martin, France. 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 12 April through 17 April 1971. Ilie Năstase and Gail Chanfreau won the singles titles.[1]
See main article: 1971 Monte Carlo Open – Men's singles. 
Ilie Năstase defeated Tom Okker 3–6, 8–6, 6–1, 6–1
Gail Chanfreau defeated Betty Stöve 6–4, 4–6, 6–4
See main article: 1971 Monte Carlo Open – Men's doubles. 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