Glasthule (/ˈɡlæsθuːl/ GLAS-thool; Irish: Glas Tuathail, meaning 'O'Toole's Stream') is a suburb of Dublin, Ireland.

It is along County Dublin’s south coast, between Dún Laoghaire, Sandycove, Glenageary and Dalkey.

Sandycove and Glasthule are served by a number of businesses and amenities, including retail outlets, public houses, a post office, restaurants, cafés and a playschool.

An Aircoach service links the area with Dublin Airport 24 hours a day.

Every year on 16 June it celebrates Bloomsday (the day on which James Joyce's novel Ulysses takes place).