Pi Tau Sigma is the International Honorary Mechanical Engineering Society and is a member of the Association of College Honor Societies. With 142 chapters installed, all but two currently maintain active status. There are chapters at universities in almost every state of the United States. The concept of Pi Tau Sigma was initiated simultaneously at the University of Illinois and at the University of Wisconsin in 1915. Pi Tau Sigma was formed in 1916 by these two schools.

Objectives
1.) Foster high ideals in the engineering profession.
2.) timulate and support departmental activities.
3.) Promote professional welfare.
4.) Develop leadership and citizenship.
5.) ... And have fun doing it.