Student Rights Act of 2018 This bill amends the Higher Education Act of 1965 to address issues concerning free speech, assembly, and association on college campuses, such as the right to invite guests to speak at campuses. For example, the bill requires public institutions of higher education to allow a person to engage in noncommercial, expressive activity in outdoor areas on campuses if the person's conduct is lawful. Expressive activities include: (1) distributing literature; (2) circulating a petition; or (3) peacefully assembling, protesting, or speaking. It excludes violence, harassment, or obscenity.