The Vasco da Gama Bridge is a cable-stayed bridge flanked by viaducts and rangeviews that spans the Tagus River near Lisbon, capital of Portugal. It is the longest bridge in Europe (including viaducts), with a total length of 17.2 km, including 0.829 km for the main bridge, 11.5 km in viaducts, and 4.8 km in dedicated access roads. The bridge is 30 m wide and 155 m in height. Longest span is 420 m long. The deepest foundation piles, up to 2.2 m in diameter, were driven down to 95 m under sea level. The bridge carries six road lanes, with a speed limit of 120 km/h, the same as motorways, except on one section which is limited to 100 km/h.

The bridge has a life expectancy of 120 years. Its purpose is to alleviate the congestion on Lisbon's other bridge (25 de Abril Bridge), and to join previously unconnected motorways radiating from Lisbon. As of 2009, the toll is €2.40 per passenger car (up to €10.80 per truck) northbound (into Lisbon). There is no toll for southbound traffic.

The bridge was opened to traffic on 29 March 1998, 18 months after construction first began, just in time for Expo 98, the World's Fair that celebrated the 500th anniversary of the discovery by Vasco da Gama of the sea route from Europe to India.