Technological University Dublin or TU Dublin is Ireland's first technological university, established on 1 January 2019, and with a history stretching back to 1887 through the amalgamated Dublin Institute of Technology which progressed from the first technical education institution in Ireland, the City of Dublin Technical Schools. It is the second-largest third-level institution in Ireland, with a student population of 28,500.

The university was formed by the amalgamation of three existing institutes of technology in the Dublin area – Dublin Institute of Technology, Institute of Technology, Blanchardstown, and Institute of Technology, Tallaght, taking over all functions and operations of these institutions. It is the eighth university in Ireland, and the fourth in the Dublin Region. The university asserts an entrepreneurial ethos and industry-focused approach, with extensive collaboration with industry for research and teaching. The flagship campus is located within Grangegorman, Dublin, with two other long-term campuses, in Tallaght and Blanchardstown, and remaining legacy sites at Bolton Street and Aungier Street.

TU Dublin has approximately 3,500 staff. Professor David FitzPatrick is the inaugural president, a role in which he serves as of 2021.