The 1971 Pittsburgh Pirates season was the 90th season for the Pittsburgh Pirates franchise; their 85th in the National League. It involved the Pirates finishing first in the National League East with a record of 97 wins and 65 losses. They defeated the San Francisco Giants three games to one in the NLCS and beat the Baltimore Orioles four games to three in the World Series. The Pirates were managed by Danny Murtaugh, and played their first full season at Three Rivers Stadium, which had opened in July the year before.

• October 15, 1970: Charlie Sands and 2 minor leaguers were traded to the Pirates by the New York Yankees for 3 minor leaguers.^[1]
• October 26, 1970: Joe Gibbon released by the Pirates.^[2]
• December 2, 1970: Freddie Patek, Bruce Dal Canton and Jerry May were traded by the Pirates to the Kansas City Royals for Bob Johnson, Jackie Hernández and Jim Campanis.^[3]
• January 29, 1971: Matty Alou and George Brunet were traded by the Pirates to the St. Louis Cardinals for Nelson Briles and Vic Davalillo.^[4]
• February 10, 1971: Danny Rivas (minors) was traded by the Pirates to the Mexico City Reds for Ramón Hernández.^[5]

In 1971, the Pirates became the first Major League Baseball team to field an all-black starting lineup.^[6] Taking the field, on September 1, was Rennie Stennett, Gene Clines, Roberto Clemente, Willie Stargell, Manny Sanguillén, Dave Cash, Al Oliver, Jackie Hernández, and Dock Ellis.^[7]

• Roberto Clemente, Babe Ruth Award^[15]
• Roberto Clemente, World Series Most Valuable Player Award^[16]
• Roberto Clemente, Gold Glove Award^[17]

• Johnson, Lloyd; Wolff, Miles, eds. (1997). The Encyclopedia of Minor League Baseball (2nd ed.). Durham, North Carolina: Baseball America. ISBN 978-0-9637189-8-3.
• Markusen, Bruce (2009). The Team That Changed Baseball: Roberto Clemente and the 1971 Pittsburgh Pirates. Yardley, Pennsylvania: Westholme Publishing. ISBN 978-1-59416-089-9.