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