Trinity College is located at the heart of Dublin on College Green, opposite to the historic Irish Houses of Parliament. The college proper occupies 190,000 m2 (47 acres), with many of its buildings ranged around large quadrangles (known as 'squares') and two playing fields. Academically, it is divided into three faculties comprising 25 schools, offering degree and diploma courses at both undergraduate and postgraduate levels.

The Library of Trinity College is a legal deposit library for Ireland and Great Britain, containing over 6.2 million printed volumes and significant quantities of manuscripts, including the Book of Kells.