The 12th Dáil was elected at the 1944 general election on 30 May 1944 and first met on 9 June 1944. The members of Dáil Éireann, the house of representatives of the Oireachtas (legislature), of Ireland are known as TDs. It sat with the 5th Seanad as the two Houses of the Oireachtas.
The 12th Dáil was dissolved by President Seán T. O'Kelly on 12 January 1948, at the request of the Taoiseach Éamon de Valera. The 12th Dáil lasted .
Composition of the 12th Dáil
- 4th government
{| class="wikitable sortable" style="font-size: 95%;"
|-
!colspan=2|Party
!May 1944
!Jan. 1948
!class"unsortable"|Change
|-
| style="background-color: " |
|style="background-color:#DAEFF2" | Fianna Fáil
|style="background-color:#DAEFF2" align="center"| 76
|style="background-color:#DAEFF2" align="center"| 76
|style="background-color:#DAEFF2" align="center"|
|-
|
|align="center"| 30
|align="center"| 25
|align="center"| 5
|-
|
|align="center"| 11
|align="center"| 11
|align="center"|
|-
|
|align="center"| 8
|align="center"| 8
|align="center"|
|-
| style="background-color: " |
| National Labour
|align="center"| 4
|align="center"| 4
|align="center"|
|-
|
|align="center"| 1
|align="center"| 1
|align="center"|
|-
|
|
|align="center"| 2
|align="center"| 2
|-
|
|align="center"| 8
|align="center"| 8
|align="center"|
|-
|
|
|align="center"| 1
|align="center"| 1
|-
|
|
|align="center"| 2
|align="center"| 2
|-
! colspan="2" |Total
! colspan="3" align="center" | 138
|}
Graphical representation
This is a graphical comparison of party strengths in the 12th Dáil from June 1944. This was not the official seating plan.
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Ceann Comhairle
On 9 June 1944, Frank Fahy (FF), who had served as Ceann Comhairle since 1932, was proposed by Éamon de Valera and seconded by Richard Mulcahy for the position, and was elected without a vote.
TDs by constituency
The 138 TDs elected at the 1944 general election are listed by Dáil constituency.