塔霍河（拉丁语：Tagus，西班牙语：Tajo，葡萄牙语：Tejo），也称塔古斯河或特茹河，是伊比利亚半岛最大的河流。它发源于西班牙阿尔瓦拉辛附近的山脉，向西流淌，最终在葡萄牙里斯本注入大西洋。塔霍河全长1038公里，其中716公里位于西班牙境内，47公里为西班牙和葡萄牙的边境，其余的275公里在葡萄牙境内。塔霍河的流域面积为80,100平方公里，为伊比利亚半岛第二大流域的河流，仅次于杜罗河。它的大部分路线非常狭窄，在经过阿尔莫洛尔城堡后进入一个宽广的山谷，容易引起洪水泛滥。

塔霍河流经的城市主要有：阿兰胡埃斯、托莱多、塔拉韦拉德拉雷纳、阿尔坎塔拉、阿布兰特什、圣塔伦和里斯本。

The Tagus (Spanish:Tajo [ˈtaxo]; Portuguese:Tejo [ˈtɛʒu]; Latin:Tagus; Ancient Greek: Τάγος Tagos) is the longest river on the Iberian Peninsula. It is 1,038 km (645 mi) long, 716 km (445 mi) in Spain, 47 km (29 mi) along the border between Portugal and Spain and 275 km (171 mi) in Portugal, where it empties into the Atlantic Ocean near Lisbon. It drains an area of 80,100 square kilometers (30,927 sq mi) (the second largest in the Iberian peninsula after the Douro). The Tagus is highly utilized for most of its course. Several dams and diversions supply drinking water to most of central Spain, including Madrid, and Portugal, while dozens of hydroelectric stations create power. Between dams it follows a very constricted course, but after Almourol it enters a vast alluvial valley prone to flooding. At its mouth is a large estuary on which the port city of Lisbon is situated.