Age of reason may refer to the following:

• 17th-century philosophy, as a successor of the Renaissance and a predecessor to the Age of Enlightenment
• Age of Enlightenment in its long form of 1600-1800
• The Age of Reason, a book by Thomas Paine
• Age of Reason, a 1988 album by John Farnham
• L'âge de raison, by Jean-Paul Sartre
• Cult of Reason, a brief time in 1793-4 during the French Revolution
• In the Roman Catholic and Eastern Orthodox Churches, the age, usually around seven or eight years old, when children are considered capable of understanding and participating in the sacraments.
• In psychology, the age where a child is capable of carrying on complex conversation with an adult, usually around seven or eight years.

See also

• The Age of Unreason, a series of four science fiction novels by Gregory Keyes.