Texas Tech University (Texas Tech, Tech, or TTU) is a public research university in Lubbock, Texas. Established on February 10, 1923 (1923-02-10), and called Texas Technological College until 1969, it is the main institution of the five-institution Texas Tech University System. The university's student enrollment is the sixth-largest in Texas as of the Fall 2020 semester. As of fall 2020, there were 40,322 students (33,269 undergraduate and 7,053 graduate) enrolled at Texas Tech. With over 25% of its undergraduate student population identifying as Hispanic, Texas Tech University is a designated Hispanic-serving institution (HSI).

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. Texas Tech is classified among "R1: Doctoral Universities – Very high research activity." Research projects in the areas of epidemiology, pulsed power, grid computing, classics, nanophotonics, atmospheric sciences, 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 40 bowl appearances, which is 17th most of any university. The Red Raiders basketball team has made 14 appearances in the NCAA Division I Tournament. Bob Knight, who has the fifth-most wins as a head coach in men's NCAA Division I basketball history, served as the team's head coach from 2001 to 2008. The Lady Raiders basketball team won the 1993 NCAA Division I Tournament. In 1999, Texas Tech's Goin' Band from Raiderland received the Sudler Trophy, which is awarded to "recognize collegiate marching bands of particular excellence".

Although the majority of the university's students are from the southwestern United States, the school has served students from all over the U.S. and more than 100 other countries. Many Texas Tech alumni and former students have gone on to prominent careers in government, business, science, medicine, education, sports, and entertainment.