Indiana State Fairgrounds Coliseum gas explosion: A gas explosion at the Indiana State Fairgrounds Coliseum in Indianapolis kills 81 people and injures another 400 during an ice show.

On October 31, 1963, a gas explosion occurred at the Indiana State Fairgrounds Coliseum in Indianapolis, United States, killing 81 people and injuring about 400 others. It was one of the worst disasters in the history of the state.

A gas explosion is the ignition of a mixture of air and flammable gas, typically from a gas leak. In household accidents, the principal explosive gases are those used for heating or cooking purposes such as methane, propane, or butane. In industrial explosions, many other gases, like hydrogen, as well as evaporated (gaseous) gasoline or ethanol play an important role. Industrial gas explosions can be prevented with the use of intrinsic safety barriers to prevent ignition, or use of alternative energy.

The Corteva Coliseum is a 6,500-seat indoor multi-use arena, located on the Indiana State Fairgrounds in Indianapolis. It was originally called the Indiana State Fairgrounds Coliseum and later the Pepsi Coliseum, Fairgrounds Coliseum, and Indiana Farmers Coliseum.