East Texas is a distinct geographic and ecological area in the U.S. state of Texas.

According to the Handbook of Texas, the East Texas area "may be separated from the rest of Texas roughly by a line extending from the Red River in north central Lamar County southwestward to east central Limestone County and then southeastward to Galveston Bay", though some separate the Gulf Coast area into a separate region.

This area includes all or parts of 49 counties, totaling almost 40,000 square miles (100,000 km²) and a population of almost 6 million. Another popular, somewhat simpler, definition defines East Texas as the region between Interstate 45 as the western border linking Dallas and Houston, the Louisiana border as the eastern border, the Oklahoma border as the northern border, and Galveston Bay shores as the southern border.

Most of the region consists of the Piney Woods ecoregion, and East Texas can sometimes be reduced to include only the Piney Woods. Houston is rarely regarded as a part of East Texas and is more closely associated with the Coastal Bend along the Gulf of Mexico; as has been the case for most of the city's recent history. At the fringes, towards Central Texas, the forests expand outward toward sparser trees and eventually into open plains.

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.