Age of reason may refer to:

• 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 (album), a 1988 album by John Farnham containing the song "Age of Reason"
• The Age of Reason (Sartre), 1945 novel by Jean-Paul Sartre
• Cult of Reason, a brief time in 1793-4 during the French Revolution
• Age of reason (canon law), in the Roman Catholic Church, the age, usually around seven or eight years old, when children are considered capable of understanding and participating in the sacraments
• In Developmental psychology, the age where a child is capable of carrying on complex conversation with an adult, usually around seven or eight years
• The blog of the National Youth Rights Association

See also

• Rage of Reason, a single by Polish symphonic black metal band Vesania
• The Age of Unreason, a series of four science fiction novels by Gregory Keyes.
• Bridget Jones: The Edge of Reason