Quadrilateral (disambiguation)

A quadrilateral, in geometry, is a polygon with 4 sides.

Quadrilateral may also refer to:
 * Complete quadrilateral, in projective geometry, a configuration with 4 lines and 6 points
 * Chicago-Lambeth Quadrilateral, a four-point statement of fundamental doctrine, in the Anglican Communion
 * Wesleyan Quadrilateral, the four sources of doctrine in the Methodist Church
 * Golden Quadrilateral, a network of highways in India
 * Quadrilateral Security Dialogue, a strategic alliance of the United States, Japan, Australia and India within Asia.
 * Quadrilateral Treaty, a pact between the Argentine provinces of Buenos Aires, Santa Fe, Entre Ríos and Corrientes, signed on 25 January 1822.
 * Quadrilatero, in the Revolutions of 1848, in the Italian states - an area within the group of fortresses at Mantua, Verona, Peschiera and Legnago
 * Quadrilateral (horse), thoroughbred racehorse
 * "Quadrilateral", an alternative name for Southern Dobruja mostly used by Romanians (Cadrilater)