| 11th Seanad | |
| Body: | Seanad Éireann |
| Country: | Ireland |
| Meeting Place: | Leinster House |
| Term Start: | 23 June 1965 |
| Term End: | 24 July 1969 |
| Before: | 10th Seanad |
| After: | 12th Seanad |
| Membership1: | 60 |
| Chamber1 Leader1 Type: | Cathaoirleach |
| Chamber1 Leader1: | Liam Ó Buachalla (FF) |
| Chamber1 Leader2 Type: | Leas-Chathaoirleach |
| Chamber1 Leader2: | James Dooge (FG) |
| Chamber1 Leader3 Type: | Leader of the Seanad |
| Chamber1 Leader3: | Thomas Mullins (FF) |
The 11th Seanad was in office from 1965 to 1969. An election to Seanad Éireann, the Senate of the Oireachtas (Irish parliament), followed the 1965 general election to the 18th Dáil. The senators served until the close of poll for the 12th Seanad in 1969.
There are a total of 60 seats in the Seanad: 43 were elected on five vocational panels, 6 were elected from two university constituencies and 11 were nominated by the Taoiseach.
The following table shows the composition by party when the 11th Seanad first met on 23 June 1965.
| Vocational panels | NUI | DU | Nominated | Total | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Admin | Agri | Cult & Educ | Ind & Comm | Labour | ||||||||
| Fianna Fáil | 3 | 5 | 3 | 4 | 5 | 0 | 0 | 9 | 29 | |||
| 2 | 4 | 1 | 3 | 3 | 0 | 0 | 0 | 13 | ||||
| 1 | 1 | 1 | 1 | 2 | 0 | 0 | 0 | 6 | ||||
| Independent | 1 | 1 | 0 | 1 | 1 | 3 | 3 | 2 | 12 | |||
| Total | 7 | 11 | 5 | 9 | 11 | 3 | 3 | 11 | 60 | |||