Texas Tech University, often referred to as Texas Tech or TTU, is a public research university in Lubbock, Texas, United States. Established on February 10, 1923, and originally known as Texas Technological College, it is the leading institution of the Texas Tech University System and has the seventh-largest student body in the state of Texas. With 1,839 acres (744 ha), it has the second largest contiguous campus in the United States and is the only school in Texas to house an undergraduate institution, law school, and medical school at the same location.

The university offers degrees in more than 150 courses of study through 13 colleges and hosts 60 research centers and institutes. Texas Tech University has awarded over 200,000 degrees since 1927, including over 40,000 graduate and professional degrees. The Carnegie Foundation classifies Texas Tech as having "high research activity". Research projects in the areas of epidemiology, pulsed power, grid computing, nanophotonics, and wind energy are among the most prominent at the university. The Spanish Renaissance-themed campus, described by author James Michener as "the most beautiful west of the Mississippi until you get to Stanford", has been awarded the Grand Award for excellence in grounds-keeping, and has been noted for possessing a public art collection among the ten best in the United States.

The Texas Tech Red Raiders are charter members of the Big 12 Conference and compete in Division I for all varsity sports. The Red Raiders football team has made 34 bowl appearances, which is 17th most of any university. The Red Raiders men's basketball team has made 14 appearances in the NCAA Division I Tournament. Bob Knight, the second most winningest coach in men's NCAA Div. I basketball history, served as the team's head coach from 2001 to 2008. The Lady Raiders women's basketball team won the 1993 women's national championship. In 1999, Texas Tech's Goin' Band from Raiderland received the Sudler Trophy, which is awarded to "recognize collegiate marching bands of particular excellence".

Though the majority of the university's students originate in the southwestern United States, the school has served students from all 50 states and more than 100 foreign countries. Texas Tech University alumni and former students have gone on to prominent careers in government, business, science, medicine, education, sports, and entertainment.