Piedras Negras is a city in Coahuila, Mexico, located at .

It stands on the U.S.-Mexico border, across the Río Bravo (Rio Grande) from Eagle Pass in the U.S. state of Texas. In 2003 Piedras Negras had an estimated population of 132,900 people.

The city was founded in 1849. It was renamed Ciudad Porfirio Díaz in 1888, in homage to President Porfirio Díaz, but it reverted to its original name following the Mexican Revolution.

The Spanish words Piedras Negras translate as "black rocks" – a reference to the coal deposits that exist in the area. Across the river, coal was formerly mined on the US side at Dolchburg, near Eagle Pass, in a mine that closed around 1905 after a fire. Mexico currently operates a large coal-fired power plant named "Carbón 2" near Piedras Negras.

On 4 April 2004, the Río Escondido (a tributary of the Río Bravo) broke its banks and some 80 residents of the Piedras Negra area were killed by or disappeared in the resulting flash floods. See: BBC coverage.

Piedras Negras main attractions are:

1. The ruins of San Bernardo Mission (XVIII century)
2. The Handicrafts Museum
3. The Culture House
4. The Hunting and Fishing Club
5. De La Ventana Caverns
6. The Mercado, with a wide variety of Mexican crafts.(Mercado Zaragoza), Folkloric commercial center where one is able to buy a variety of original arts and crafts from the state: vases, leather articles, crystal, clay and ceramic, as well as regional candy. All at very reasonable prices.
7. El Santuario de Nuestra Señora de Guadalupe, Built in 1859 of ashlar, cement and wood, this church has survived the battles of the Cristero movement in 1927 and an explosion in 1934, leading to its renovation in 1935. The construction of its current towers began in 1950.
8. As of mid 2005, a new park called Plaza de las Tres Culturas, which means Three Culture Plaza. It is a homage to Mexico's 3 main indigenous cultures: Aztec, Mayan, and Olmeca. In it there is a replica of a pyramid of each of the cultures, the biggest one being the Pyramid of the Sun, for which the real building is locaten on Teotihuacan, which is near Mexico City.
9. The Nacho Fest held every year, conmemorating the invention of the Nacho there

Cities in Coahuila | International border crossings

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