| Glasthule | |
| Native Name: | Irish: Glas Tuathail |
| Settlement Type: | Suburb of Dublin |
| Pushpin Map: | Dublin#Ireland |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Dublin |
| Subdivision Type: | Country |
| Subdivision Name: | Ireland |
| Subdivision Type1: | Province |
| Subdivision Name1: | Leinster |
| Subdivision Type3: | County |
| Subdivision Name3: | Dún Laoghaire–Rathdown |
| Unit Pref: | Metric |
| Population As Of: | 2006 |
| Population Urban: | 2641 |
| Population Density Km2: | auto |
| Utc Offset1: | +0 |
| Timezone1 Dst: | IST (WEST) |
| Utc Offset1 Dst: | -1 |
| Coordinates: | 53.2871°N -6.1235°W |
| Area Code: | 01 (+3531) |
| Postal Code Type: | Eircode (Routing Key) |
| Postal Code: | A96 |
| Blank Name: | Irish Grid Reference |
Glasthule (;) 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.
The Presentation Brothers maintain a house in Glasthule and ran Presentation College Glasthule, a secondary school for boys, until 2006. The Harold National School, next door to Presentation Brothers still operates today.
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). The James Joyce Tower is located in nearby Sandycove.
It is the main setting for Jamie O'Neill's 2001 novel At Swim, Two Boys.