Trinity College (full name: The College of the Holy and Undivided Trinity in the University of Oxford, of the foundation of Sir Thomas Pope (Knight)) is a constituent college of the University of Oxford in England. The college was founded in 1555 by Sir Thomas Pope, on land previously occupied by Durham College, home to Benedictine monks from Durham Cathedral.

Despite its large physical size, the college is relatively small in terms of student numbers at approximately 400. It was founded as a men's college and has been coeducational since 1979. As of 2023, the total funds of Trinity amounted to more than £224 million, including a financial endowment of £191 million.

Trinity has produced three British prime ministers, placing it third after Christ Church and Balliol in terms of former students who have held that office.