Commissions comprise the subordinate legislative bodies of the ASUCD Senate. The primary duty of a commission is to advise the ASUCD Senate on matters relevant to their individual specialty. Many commissions also plan events and activities that pertain to their field of expertise and benefit the student body in educational or entertaining ways.

Commissions hire new members at the end of the Fall and Spring Quarter each year, though vacancies often occur mid-year as well. Each commission has nine voting members and up to four alternate members.