The Gate of Europe towers (Spanish: Puerta de Europa, - Door of Europe-), also known as KIO Towers (Torres KIO), are twin office buildings near the Plaza de Castilla in Madrid, Spain.

The Gate of Europe towers were designed by the American architects Philip Johnson and John Burgee, built by Fomento de Construcciones y Contratas[1] and commissioned by the Kuwait Investment Office (hence their initial name "Torres KIO" or "KIO Towers").

Leslie E. Robertson Associates, RLLP New York (LERA) provided structural engineering services.

After the receivership of Grupo Torras, KIO had to sell the buildings, which are now owned by CaixaBank and Realia.

[2][3] The towers were also shot in the song sequence "oru koodai sunlight" in the popular Tamil film Sivaji.