Aquarius ( , water-bearer or cup-bearer) is the eleventh sign of the zodiac, situated between Capricornus and Pisces. Its symbol is ( ), Unicode ♒, representing part of a stream of water.

Aquarius is one of the oldest recognized constellations along the zodiac, the sun's apparent path. It is found in a region often called the Sea due to its profusion of watery constellations such as Cetus, Pisces, Eridanus, etc. Sometimes, the river Eridanus is depicted spilling from Aquarius' watering pot.

An astrological age is a time period in astrology which is believed by some to parallel major changes in the Earth's inhabitants' development. An astrological age roughly corresponds to the time taken for the vernal equinox to move from one of the twelve constellations of the zodiac into the next one.

The Ages in astrology, however, do not correspond directly to actual constellation boundaries where the vernal equinox may be occurring in a given time.

Various ages are described below, such as the "Age of Aquarius" explained under: Great Month of Aquarius (Aquarius-Leo).

Aquarius is a card game created by Andrew Looney and published by Looney Labs. The game play has some similarity to the game of dominoes. The card design and feel of the game is influenced by the Hippie movement and the art of Peter Max. The deck contains 5 Goal cards, 15 Action cards and 40 Element cards.

"Aquarius/Let the Sunshine In", sometimes incorrectly known as "The Age of Aquarius", is a medley of the songs "Aquarius" and "The Flesh Failures (Let The Sunshine In)" from the musical Hair, originally released by The Fifth Dimension as a single which held the number one position on the U.S. Billboard Hot 100 for six weeks in 1969 and was certified Platinum. It was performed by Melba Moore for the film version.