Libra is the seventh astrological sign in the Zodiac, originating from the constellation of Libra. In western astrology, this sign is no longer aligned with the constellation as a result of the precession of the equinoxes. In astrology, Libra is considered a "masculine", positive (extrovert) sign. It is also considered an air sign and is one of four cardinal signs. Libra is ruled by the planet Venus (which also rules Taurus). Being the seventh sign of the zodiac, Libra has been associated with the astrological seventh house.

Individuals born when the Sun was in this sign are considered Libra individuals. Under the tropical zodiac, the Sun enters Libra on the moment of autumnal equinox by definition on September 23, leaving it on October 22. Under the sidereal zodiac, it is currently there roughly around October 18 and November 16. The Sanskrit name of Libra in Hindu astrology is Tula.

Libra, also known as "The Scales" or "Balance", is the only symbol of the zodiac that is represented by an inanimate object, rather than an animal or human.

Generally, Libra is considered compatible with same element signs, Aquarius, Gemini, and Libra itself. These signs share an airy demeanor and are believed to relate with each other on that merit.

There are many variables that determine compatibility in astrology, such as birth dates, birth months, birth years, position of a sign within the Moon, Stars, etc. The signs listed as compatible with Libra do not reflect an individual profile or individual reading as interpreted within astrology, but rather reflect a general guideline and reference to compatibility as dictated by variables such as Qualities and Elements within the Zodiac. The branch of astrology dealing with interpersonal compatibilities is called Synastry.