Guerrero is a state in the United Mexican States.

Guerrero is bordered by the states of Michoacán to the west, México, Morelos, and Puebla to the north, Oaxaca to the east, and the Pacific Ocean to the south. Guerrero has an area of about 63,749 km². In 2003, the population was estimated at 3,167,400 people.

The state capital is the city of Chilpancingo. Guerrero also contains the cities of Acapulco, Iguala, and Taxco.

The state is an important tourist destination. There are three main areas of tourism, known as the Triángulo del Sol (triangle of the sun). The first is Taxco, a colonial town noted for its silverware. The second is Acapulco. The third is Ixtapa/Zihuatanejo. Ixtapa is a destination created by the federal government to increase tourism during the slow economy of the 1980s. In Mexico the state is also renowned for violence, with vendettas deeply rooted in the local tradition (especially blood feuds between people of the coast and those of the mountains) and drug production in the mountainous interior. (Guerrero is the Spanish word for "warrior", but this is mere coincidence: the state was named in honour of Vicente Guerrero, a locally born Independence War hero.)

Amnesty International, local Human Rights organizations like the Human Rights Center of the Mountains Tlachinollan as well as the Office of the United Nations High Commissioner for Human Rights denounce Human Rights violations like torture, arbitrary detention, forced disappearance and extrajudicial killings in Guerrero.

The climate of Guerrero is tropical for the most part but becomes more moderate closer to the Sierra del Sur.