Tennessee Technological University (Tennessee Tech) is a public research university in Cookeville, Tennessee, United States. It was formerly known as Tennessee Polytechnic Institute (1915–1965), and before that as University of Dixie (1909–1915), the name under which it was founded as a private institution. Affiliated with the Tennessee Board of Regents, the university is governed by a board of trustees. It is classified among "R2: Doctoral Universities – High research activity".

Tennessee Tech places special emphasis on undergraduate education in fields related to engineering, technology, and computer science, although degrees in education, liberal arts, agriculture, nursing, and other fields of study can be pursued as well. Additionally, there are graduate offerings in engineering, education, business, and the liberal arts. As of the 2018 fall semester, Tennessee Tech enrolls more than 10,000 students (9,006 undergraduate and 1,180 graduate students), and its campus has 87 buildings on 235 acres (95 ha) centered along Dixie Avenue in northern Cookeville.

Tennessee Tech athletic teams compete in the Ohio Valley Conference.