Theta Tau (ΘΤ) is a professional collegiate engineering fraternity. The fraternity has programs to promote the social, academic, and professional development of its members. Theta Tau is the oldest and largest professional engineering fraternity and has a membership of more than 50,000 men and women who study engineering in all its various branches on over 100 college campuses.

The Rube Goldberg Machine Contest is a contest in which students of all ages build Rube Goldberg machines to complete an everyday task in the style of American cartoonist Rube Goldberg. The contest is held internationally and, after the Covid-19 pandemic, digitally. Live regional contests and local and regional winners are eligible and invited to compete in the national contest.