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.

Ilie Năstase and Gail Chanfreau won the singles titles.

[3] 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 This tennis-related competition article is a stub.

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