The International Jugglers' Association or IJA is the world's oldest and largest nonprofit circus organization, and is open to members worldwide. It was founded in the United States in 1947, with the goal of providing, "an organization for jugglers that would provide meetings at regular intervals in an atmosphere of mutual friendship." Although its focus lies on juggling, its programs also support other circus disciplines.

Juggling is a physical skill, performed by a juggler, involving the manipulation of objects for recreation, entertainment, art or sport. The most recognizable form of juggling is toss juggling. Juggling can be the manipulation of one object or many objects at the same time, most often using one or two hands but other body parts as well, like feet or head. Jugglers often refer to the objects they juggle as props. The most common props are balls, clubs, or rings. Some jugglers use more dramatic objects such as knives, fire torches or chainsaws. The term juggling can also commonly refer to other prop-based manipulation skills, such as diabolo, plate spinning, devil sticks, poi, cigar boxes, contact juggling, hooping, yo-yo, hat manipulation and kick-ups.