1973 Northern Ireland border poll|
|
| Northern Ireland within Great Britain & Ireland | 
| Voting system | Majority voting | 
|---|
| Outcome | Northern Ireland remains a constituent part of the United Kingdom | 
|---|
|
| 
| Choice | Votes | % |  
| Remain part of the United Kingdom | 591,280 | 98.92% |  
| Join with the Republic of Ireland | 6,463 | 1.08% |  
| Valid votes | 597,743 | 99.01% |  
| Invalid or blank votes | 5,973 | 0.99% |  
| Total votes | 603,716 | 100.00% |  
| Registered voters/turnout | 1,029,544 | 58.64% |  | 
| Source: Results of the "Border Poll" Referendum of 1973 | 
The 1973 Northern Ireland border poll was a referendum held in Northern Ireland on 8 March 1973 on whether Northern Ireland should remain part of the United Kingdom or join with the Republic of Ireland to form a united Ireland. It was the first time that a major referendum had been held in any region of the United Kingdom. The referendum was boycotted by nationalists and resulted in a conclusive victory for remaining in the UK. On a voter turnout of 58.7 percent, 98.9 percent voted to remain in the United Kingdom, meaning the outcome among registered voters was not affected by the boycott.