List of 1971 box office number-one films in the United States

This is a list of films which placed number one at the weekly box office in the United States during 1971 per Variety. The data was based on grosses from 20 to 24 key cities and therefore, the gross quoted may not be the total that the film grossed nationally in the week. The weekly chart was based on the first-run situations in the top 10 markets plus an additional 12 to 14 cities of lesser size.

Highest-grossing films
Highest-grossing films of 1971 by calendar year gross based on the cities covered by Variety for the weekly charts.