Upset

Upset may refer to:


 * Upset (band), an American rock band
 * Upset (competition), where a likely winner loses
 * "Upset" (Hit the Floor), an episode of the television series Hit the Floor
 * Upset (horse), a racehorse
 * Upset (wastewater treatment), temporarily decreased effluent quality
 * Aircraft upset, a dangerous aviation condition
 * Upper set, in mathematics
 * UpSet Plot, in data visualization
 * Upset forging, a forging process where a workpiece's diameter is increased by compressing its length.
 * Upset, a type of fault in wood, see Shakes (timber) § Thunder shake or upset