The 51st General Assembly of Prince Edward Island was in session from November 23, 1966, to March 26, 1970. The Liberal Party led by Alex Campbell formed the government.
Prosper Arsenault was elected speaker.
There were five sessions of the 51st General Assembly:
| Session | Start | End |
|---|---|---|
| 1st | November 23, 1966 | November 24, 1966 |
| 2nd | March 14, 1967 | May 19, 1967 |
| 3rd | February 22, 1968 | April 25, 1968 |
| 4th | March 11, 1969 | June 6, 1969 |
| 5th | February 26, 1970 | March 26, 1970 |