Rio Grande Mud is the second studio album by the American rock band ZZ Top.

The album title was inspired by the Rio Grande, the river that forms the border between Mexico and Texas.

ZZ Top frontman Billy Gibbons said of the album: It was the first record that brought us into step with the writing experience.

The A-side was the album version, while the B-side featured the song with the vocals re-recorded in Spanish.

[9] AllMusic retrospectively gave the album 3.5 stars, stating: "With their second album, Rio Grande Mud, ZZ Top uses the sound they sketched out on their debut as a blueprint, yet they tweak it in slight but important ways.