In addition to their primary (degree) majors, students may pursue additional or "second" majors. The Weinberg College of Arts and Sciences and the Bienen School of Music offer their majors as primary or second majors, open to any student; other schools' majors are only available as primary majors, meaning they can only be earned by students in their home school. The completion of a second (or third) major, whether it is offered by a student's home school or another school, results in a single undergraduate degree conferred by the home school with additional majors noted on the transcript.

Dual undergraduate degree programs, which result in two different degrees, most often conferred by different schools, can be found in the Dual Bachelor's Degrees section.