The 12th Seanad was in office from 1969 to 1973. An election to Seanad Éireann, the Senate of the Oireachtas (Irish parliament), followed the 1969 general election to the 19th Dáil. The senators served until the close of poll for the 13th Seanad in 1973.
There are a total of 60 seats in the Seanad: 43 were elected on five
The following table shows the composition by party when the 12th Seanad first met on 5 November 1969.