大弯国家公园（英文：Big Bend National Park）位于美国德克萨斯州西南部，是德克萨斯州最大的国家公园。

公园与墨西哥接壤，只有一河之隔，以河中心为国界。

这条河在美国称为格兰德河（Rio Grande），在墨西哥称为北布拉沃河（Rio Bravo del Norte）。这条河在公园这里转了几乎90度弯，公园便因此而得名。

公园内大部分面积属于漆瓦瓦荒漠（Chihuahuan Desert），而格兰德河流过的地方则是绿洲和峡谷，另外公园中央有一座高山名叫Chisos Mountain，算是落矶山脉的一条余脉，因此简单来说大弯曲国家公园就是荒漠、绿洲和高山的巧妙综合体。

大弯国家公园的自然景观可以分为公园东部（主要是Boquillas峡谷）、中部（主要是Chisos山）和西部（主要是Santa Elena峡谷）三部分。

Big Bend National Park is an American national park located in West Texas, bordering Mexico. The park has national significance as the largest protected area of Chihuahuan Desert topography and ecology in the United States. 

The park protects more than 1,200 species of plants, more than 450 species of birds, 56 species of reptiles, and 75 species of mammals.

Geological features in the park include sea fossils and dinosaur bones, as well as volcanic dikes. The area has a rich cultural history, from archeological sites dating back nearly 10,000 years to more recent pioneers, ranchers, and miners.

The park encompasses an area of 801,163 acres (1,251.8 sq mi; 3,242.2 km2). For more than 1,000 miles (1,600 km), the Rio Grande/Río Bravo forms the boundary between Mexico and the United States, and Big Bend National Park administers approximately 118 miles (190 km) along that boundary. The park was named after a large bend in the river, and the Texas—Mexico border.

Because the Rio Grande serves as an international boundary, the park faces unusual constraints while administering and enforcing park rules, regulations, and policies. In accordance with the Treaty of Guadalupe Hidalgo, the park's territory extends only to the center of the deepest river channel as the river flowed in 1848. The rest of the land south of that channel, and the river, lies within Mexican territory. The park is bordered by the protected areas of Parque Nacional Cañon de Santa Elena and Maderas del Carmen in Mexico.

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