Lamb County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 13,977. Its seat is Littlefield. Lamb County is named for George A. Lamb, who died in the Battle of San Jacinto. Lamb County was the home of the Texas House Speaker Billy Wayne "Bill" Clayton, who served from 1975 until 1983.

The historic Triple Arrow Ranch in Lamb County is owned by Commissioner's Court Judge William A. Anderson, Jr., and his wife, the former LeNora Jo Thompson.

Lamb County was formed in 1876 from portions of Bexar County. It was named after George A. Lamb, a soldier in the Battle of San Jacinto.

According to the U.S. Census Bureau, the county has a total area of 1,018 square miles (2,636.6 km²), of which 1,016 square miles (2,631.4 km²) is land and 2 square miles (5.2 km²) (0.15%) is water.

Littlefield Municipal Airport is located in Lamb County, three nautical miles (6 km) west of the central business district of Littlefield, Texas.

As of the census of 2000, there were 23,722 people, 9,360 households, and 11,993 families residing in the county. The population density was 14 people per square mile (6/km²). There were 6,294 housing units at an average density of 6 per square mile (2/km²). The racial makeup of the county was 76.10% White, 4.30% Black or African American, 0.68% Native American, 0.10% Asian, 0.02% Pacific Islander, 16.95% from other races, and 1.86% from two or more races. 43.46% of the population were Hispanic or Latino of any race.

Texas (ⁱ/ˈtɛksəs/) (Alibamu: Teksi ) is the second most populous and the second most extensive of the 50 United States, and the most extensive state of the 48 contiguous United States. The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in East Texas. Located in the South Central United States, Texas shares an international border with the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the south, and borders the US states of New Mexico to the west, Oklahoma to the north, Arkansas to the northeast, and Louisiana to the east. Texas has an area of 268,820 square miles (696,200 km²), and a growing population of 25.7 million residents.

During the Spanish colonial rule, the area was officially known as the Nuevo Reino de Filipinas: La Provincia de Texas. Antonio Margil de Jesús was known to be the first person to use the name in a letter to the Viceroy of Mexico in July 20, 1716. The name was not popularly used in daily speech but often appeared in legal documents until the end of the 1800s.