The Sanremo Music Festival 1971 (), officially the 21st Italian Song Festival (), was the 21st annual Sanremo Music Festival, held at the Sanremo Casino in Sanremo between 25 and 27 February 1971, and broadcast by (RAI). The show was presented by actors Carlo Giuffrè and Elsa Martinelli.
The final night was broadcast by Programma Nazionale, while the first two nights were broadcast live only by radio. According to the rules of this edition every song was performed in a double performance by a couple of singers or groups. The winners of the festival were Nicola Di Bari and Nada with the song "Il cuore è uno zingaro".
The final of the festival were broadcast on Programma Nazionale, while the semi-finals were broadcast on radio.
Known details on the broadcasts in each country, including the specific broadcasting stations and commentators are shown in the tables below.