EX, Ex or The Ex may refer to:
Existentialism () is the philosophical study that begins with the human subject—not merely the thinking subject, but the acting, feeling, living human individual.
Extraterrestrial life refers to life occurring outside of Earth which did not originate on Earth. Such hypothetical life might range from simple prokaryotes (or comparable life forms) to beings with civilizations far more advanced than humanity.
Exercise is any bodily activity that enhances or maintains physical fitness and overall health and wellness.
Exxon Mobil Corporation, doing business as ExxonMobil, is an American multinational oil and gas corporation headquartered in Irving, Texas.
An exoplanet () or extrasolar planet is a planet outside the Solar System. The first evidence of an exoplanet was noted in 1917, but was not recognized as such.
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure.
Exponentiation is a mathematical operation, written as bn, involving two numbers, the base b and the exponent or power n.
The trait of extroversion–introversion is a central dimension of human personality theories. The terms introversion and extroversion were popularized by Carl Jung, although both the popular understanding and psychological usage differ from his original intent.
In biology, extinction is the termination of an organism or of a group of organisms (taxon), usually a species.