Alpha Chi Sigma is a co-ed professional fraternity in chemistry. We do not discriminate on the basis of gender, race, ethnicity, or creed. Membership is open to those studying chemistry, biology, biochemistry, or chemical engineering; as well as related subjects such as materials science, environmental engineering, and others. Undergraduates, graduate students, and professors all may join.

The purpose of Alpha Chi Sigma is defined by its three Objects, which are:

1. To bind its members with a tie of true and lasting friendship.
2. To strive for the advancement of chemistry both as a science and as a profession.
3. To aid its members by every honorable means in the attainment of their ambitions as chemists throughout their mortal lives.

There is no organization quite comparable to a professional fraternity. Socially, it presents members with the opportunity of meeting those interested in their work. Fraternal bonds are ever so much stronger than professional ones, but there are no bonds as strong as those created through combined fraternal and professional interests. Members of Alpha Chi Sigma, many of whom are leaders in the industrial and scientific world, all share common fraternal ideals. Purely professional organizations such as the American Chemical Society and the American Institute of Chemical Engineers have their place, and Alpha Chi Sigma constantly encourages its members to become active in these organizations. Social fraternities also offer much to the student, but only a professional fraternity -- and Alpha Chi Sigma is the only national professional chemistry fraternity in the United States -- can provide the college student and the professional in chemistry and related fields with the interests and bonds of a fraternity.