Morelos is one of the 31 constituent states of Mexico. Morelos has an area of about 4,941 square kilometers (1,907.7 sq mi), making it the second-smallest of the country's states. Morelos is bordered by Mexico State to the north-east and north-west, the Federal District to the north, Puebla to the east, and Guerrero to the south-west. In the 2007 census, the population of the state was 1,612,899 people.

The capital of Morelos is the city of Cuernavaca. Morelos also contains the cities of Cuautla, Jiutepec, and Temixco, and the pre-Columbian ruins of Xochicalco.
Morelos was named after José María Morelos, one of the leaders of the Mexican War of Independence.