Milltown is a suburb on the southside of Dublin, Ireland. Milltown was the site of several working mills on the River Dodder and is also the location of the meeting of the River Slang with the Dodder. It is located adjacent to other suburban areas such as Windy Arbour, Ranelagh, Rathmines, Dartry, Clonskeagh, and Donnybrook.

The Southside is the part of Dublin city that lies south of the River Liffey. It is an informal but commonly used term. In comparison to the city's Northside, it has historically been regarded as wealthier and more privileged, with several notable exceptions.