The 1925 Seanad was the part of the Seanad of the Irish Free State (1922–1936) in office from the 1925 Seanad election to the 1928 Seanad election. Elections to the Seanad, the Senate of the Oireachtas (parliament of the Irish Free State), took place on a triennial basis, with senators elected in stages. The 1925 Seanad included members nominated and elected in 1922, members elected in the 1925 Seanad election, and members elected to fill vacancies.

It sat as a second chamber to the 4th Dáil elected at the 1923 general election, the 5th Dáil elected at the June 1927 general election, and the 6th Dáil elected at the September 1927 general election. The Seanad of the Irish Free State was not numbered after each election, with the whole period later considered the First Seanad.

There were a total of 60 seats in the Free State Seanad. 19 Senators were elected at the 1925 Seanad election, which was the only Seanad popular election. In 1922, 30 Senators had been elected by Dáil Éireann, and 30 had been nominated by the President of the Executive Council, W. T. Cosgrave.^[1]

The following table shows the composition by party when the 1925 Seanad first met on 9 December 1925.^[2]

• Note: The entries for Senators who were elected or appointed to fill vacancies are shown in italics