Oakland-Alameda County Coliseum is a stadium in Oakland, California. It is part of the Oakland–Alameda County Coliseum Complex, with the adjacent Oakland Arena, near Interstate 880. The Coliseum is the home ballpark of the Oakland Athletics of Major League Baseball. In 2017, the playing surface was dedicated as Rickey Henderson Field in honor of Major League Baseball Hall of Famer and former Athletics left fielder Rickey Henderson.

As a multi-purpose stadium, it was the former home of the Oakland Raiders of the National Football League from 1966 until 1981 (when the team moved to Los Angeles), and again from 1995 until 2019 (when the team moved to Las Vegas). Since then, the stadium has been primarily used for baseball. It was the last remaining stadium in the United States shared by professional baseball and football teams. It has also occasionally been used for soccer, including hosting selected San Jose Earthquakes matches in 2008 and 2009, and during the 2009 CONCACAF Gold Cup.

The Coliseum has a seating capacity of up to 63,132 depending on its configuration; an upper deck dubbed "Mount Davis" by fans was added as part of a 1996 renovation for the Raiders' return to Oakland. In 2006, citing a desire to provide a more "intimate" environment, the Athletics blocked off the entirety of the Coliseum's third deck during its games, which artificially limited its capacity to 34,077 (making it the smallest stadium in Major League Baseball). On April 11, 2017, with Dave Kaval as the then-new team president, the Athletics began to reopen some of the sections in the third deck, and open the Mount Davis deck for selected marquee games;[14] this configuration makes it, by contrast, the largest baseball stadium in the United States by capacity.