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.

Look up activity in Wiktionary, the free dictionary.

• Activity theory, a learning theory in education
• Social activity (disambiguation), several concepts in the social sciences
• Activiti (software), an open source Business Process Management platform
• Active (disambiguation)

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