Ice hockey - The first mention of an ice hockey team was in 1889, and today Trinity has both men's and women's teams.

Indigenous Studies Working Group - Faculty group that promotes research and teaching of subjects related to Native Americans.

Individualized Degree Program (IDP) - Program specifically designed for adults over the age of 24 to get their undergraduate degree at Trinity.

International Studies Program

International Hip Hop Festival - Annual festival that showcases both local and international hip hop artists.

Intramural sports - Intramural sports leagues are recreational, co-ed teams that compete against one another.

Ivy - Student-run yearbook released annually.

Class Ivy - a tradition during Class Day at the Original Campus.