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West Texas is a loosely defined part of the U.S. state of Texas, generally encompassing the arid and semi-arid lands west of a line drawn between the cities of Wichita Falls, Abilene, and Del Rio.

No consensus exists on the boundary between East Texas and West Texas.[1] While most Texans understand these terms, no boundaries are officially recognized and any two individuals are likely to describe the boundaries of these regions differently. Walter Prescott Webb, American historian and geographer, suggested that the 98th meridian separates East and West Texas;[2] Texas writer A.C. Greene proposed that West Texas extends west of the Brazos River.[3]

West Texas is often subdivided according to distinct physiographic features. The portion of West Texas that lies west of the Pecos River is often referred to as "Far West Texas" or the "Trans-Pecos", a term first introduced in 1887 by Texas geologist Robert T. Hill.[4] The Trans-Pecos lies within the Chihuahuan Desert, and is the most arid portion of the state. Another part of West Texas is the Llano Estacado, a vast region of high, level plains extending into Eastern New Mexico and the Texas Panhandle. To the east of the Llano Estacado lies the “redbed country” of the Rolling Plains and to the south of the Llano Estacado lies the Edwards Plateau. The Rolling Plains and the Edwards Plateau subregions act as transitional zones between eastern and western Texas.