September 25, 1971. Paris, France.
For the first time, the show was held outside of New York. The Mr. Olympia contest was held in Paris a few days after the NABBA Mr. Universe was held in London. The IFBB Mr. Universe was also held in the same arena as the Mr. Olympia.
In this Mr. Olympia, Arnold competed unopposed. Sergio filed his application to compete in July, but was later disqualified after competing in the 1971 NABBA Pro Mr. Universe the week before. This was the first year that the IFBB instituted its rule to disqualify competitors who compete in non-sanctioned events (e.g. for rival organisations such as the NABBA.) Convenient for Arnold, as Sergio was in stellar shape. Instead, Sergio was allowed to put on an exhibition posing session for the crowd.
Arnold was in the shape of his life; rivalling the 1973 and 1974 Mr. Olympia appearances. This was Arnold's second Mr. Olympia victory and set the standard for Sergio vs. Arnold III the following year.