Trinity College, officially the College of the Holy and Undivided Trinity of Queen Elizabeth near Dublin, is the sole constituent college of the University of Dublin, a research university located in Dublin, Ireland. The college was founded in 1592 by Queen Elizabeth I as the "mother" of a new university, modelled after the collegiate universities of Oxford and Cambridge, but unlike these other ancient universities, only one college was ever established; as such, the designations "Trinity College" and "University of Dublin" are usually synonymous for practical purposes. It is one of the seven ancient universities of Britain and Ireland, as well as Ireland's oldest surviving university.

Trinity College is widely considered to be the most prestigious university in Ireland, and amongst the most elite in Europe. This is principally due to its extensive history, highly competitive admissions procedure, reputation with social elitism and unique relationship with both the University of Oxford and the University of Cambridge. In accordance with the formula of ad eundem gradum, a form of recognition that exists among the three universities, a graduate of Oxford, Cambridge, or Dublin can be conferred with the equivalent degree at either of the other two universities without further examination. Trinity College, Dublin is a sister college to St. John's College, Cambridge and Oriel College, Oxford.