Activity

Activity may refer to:


 * Action (philosophy), in general
 * Human activity: human behavior, in sociology behavior may refer to all basic human actions, economics may study human economic activities and along with cybernetics and psychology may study their modulation
 * Recreation, or activities of leisure
 * The Aristotelian concept of energeia, Latinized as actus
 * Activity (UML), a major task in Unified Modeling Language
 * Activity, the rate of catalytic activity, such as enzyme activity (enzyme assay), in physical chemistry and enzymology
 * Thermodynamic activity, the effective concentration of a solute for the purposes of mass action
 * Activity (project management)
 * Activity, the number of radioactive decays per second
 * Activity (software engineering)
 * Activity (soil mechanics)
 * HMS Activity (D94), an aircraft carrier of the Royal Navy
 * "Activity", a song by Way Out West from Intensify
 * Cultural activities, activities referred to culture.