East Mayo (UK Parliament constituency)
East Mayo was a parliamentary constituency in Ireland, which returned one Member of Parliament to the House of Commons of the Parliament of the United Kingdom from 1885 to 1922.
Prior to the 1885 general election the area was part of the Mayo constituency. From 1922 it was not represented in the UK Parliament.
Boundaries
This constituency comprised the eastern part of County Mayo.1885–1922: That part of the barony of Costello not contained within the constituency of South Mayo and that part of the barony of Gallen not contained within the constituency of North Mayo.
Members of Parliament
| Years | Member | Party |
| 1885–1890 | John Dillon | Irish Parliamentary Party |
| 1891–1900 | John Dillon | Anti-Parnellite |
| 1900–1918 | John Dillon | Irish Parliamentary Party |
| 1918–1922 | Éamon de Valera | Sinn Féin |