Rathdown may refer to:
- Rathdown (County Dublin barony) an Irish administrative barony which gives its name to:
- Dublin Rathdown (Dáil constituency)
- Dún Laoghaire–Rathdown, a county in Ireland
- Baron Rathdown, a title in the Peerage of Ireland
- Rathdown, County Wicklow, an Irish administrative barony
Similar spelling
edit- Rathdowney, County Laois, Ireland
- Rathowen, County Westmeath, Ireland