A quadrilateral, in geometry, is a polygon with 4 sides.
Quadrilateral may also refer to:
Places "Quadrilateral", an alternative name for Southern Dobruja, an area of north-eastern Bulgaria mostly used by Romanians Quadrilatero, in the 1848 revolutions, in the Italian states, an area within the group of fortresses at Mantua, Verona, Peschiera, and Legnago
Political alliances 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.
Religion 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
Other uses Complete quadrilateral, in projective geometry, a configuration with 4 lines and 6 points Golden Quadrilateral, a network of highways in India Quadrilateral (horse), thoroughbred racehorse Quadrilateral (film), a 2024 Peruvian film
See also Quadriliteral Quadrangle (geography)