The International Softball Federation (ISF) is the international governing body for the sport of softball with its world headquarters and training centre at Plant City, Florida. The ISF is a non-profit corporation recognized by the International Olympic Committee (IOC) and SportAccord.

Softball is a sport similar to baseball, and it is played with a larger ball on a smaller field and with only underhand pitches permitted. Softball is played competitively at club levels, the college level, and the professional level. The game was first created in 1887 in Chicago by George Hancock.