A Capella Groups - Trinity's varied singing groups, which perform mainly without instrumental accompaniment.
Accidentals - Trinity's all-male a capella group.
Admissions Building - Home to the College's Admissions, Financial Aid, and Career Services offices.
Aetna Quantitative Center - Center which works collaboratively with Trinity's Mathematics Department to provide support for students enrolled in math courses.
African Americans at Trinity - A history of Black peoples, organizations, and experiences at Trinity College.
Air Force Reserves Officer Training Corps - Trinity's ROTC program, in existence from 1948 until 1970.
Albert C. Jacobs Life Sciences Center (LSC) - Building on the south side of campus that houses the biology, psychology, and neuroscience departments.
Alma Mater - Trinity College's official anthem.
Alumni Association - Network of Trinity graduates working to preserve their relationship with the College.
Alumni Hall - Trinity's gymnasium, which was destroyed by fire in 1967.
Anadama Dormitory - Student dormitory that was located at 111 Crescent Street.
Ann Plato Fellowship - Annual fellowship given to a pre- or post-doctoral applicant to promote diversity within the College.
Archers of Washington College - A student military drill group, which originated from the Phalanx.
Arboretum - As of 2023, Trinity College is a Level 1 arboretum.
Architecture - Trinity College is the finest example of Collegiate Gothic architecture in the United States, but it is also home to other interesting and significant designs.
Asian Americans at Trinity - A history of Asian American people, organizations, and experiences at Trinity College.
Asian-American Student Association (AASA) House - A cultural house on campus meant to support students of Asian descent.
Paul D. Assaiante Tennis Center - Trinity's tennis courts, built in 2010 and named after squash and tennis coach Paul Assaiante.
Athenaeum Society - A literary and debate social organization founded in 1826.
Athletes of Color Coalition - A group formed to build community for Trinity's athletes of color.
Athletic Association - Group composed of students, faculty, and alumni that managed the school's athletic spaces and teams.
Athletic Clubs - historic and now-defunct athletic groups and teams. For current club sports, see Club Sports.
Athletics at Trinity - Trinity's competitive and leisurely organized sports.
Austin Arts Center - Building containing Trinity's fine arts based departments and spaces.