Purdue University, located in West Lafayette, Indiana, U.S., is the flagship university of the six-campus Purdue University system. Purdue was founded on May 6, 1869, as a land-grant university when the Indiana General Assembly, taking advantage of the Morrill Act, accepted a donation of land and money from Lafayette businessman John Purdue to establish a college of science, technology, and agriculture in his name. The first classes were held on September 16, 1874, with six instructors and 39 students. Today, Purdue enrolls the second largest student body of any university in Indiana as well as the second largest international student population of any public university in the United States.

Purdue offers both undergraduate and graduate programs in over 210 major areas of study. The university has also been highly influential in America's history of aviation, having established the first college credit offered in flight training, the first four-year bachelor's degree in aviation, and the first university airport (Purdue University Airport). In the mid-20th century, Purdue's aviation program expanded to encompass advanced spaceflight technology giving rise to Purdue's nickname, Cradle of Astronauts. Twenty-two Purdue graduates have gone on to become astronauts, including Gus Grissom (one of the original Mercury Seven astronauts), Neil Armstrong (the first person to walk on the moon), and Eugene Cernan (the most recent person to walk on the moon).