The Northern Ireland Electoral Commission will today facing calls for the repeal of legislation that requires every voter in Northern Ireland to register every year.
As his party prepared to meet the commission in Belfast, Sinn Féin Assembly member Mr Alex Maskey said 211,000 people in Northern Ireland had been disenfranchised since registration was introduced in 2002.
The South Belfast MLA said: "This is the direct result of the legislation passed two years ago by the British Government at the behest of the SDLP and UUP.
"The legislation has targeted in particular the young, those living in the most disadvantaged communities and those with disabilities and special needs," he said.
"It is quite clear that unless the legislation is changed then the register will continue to shred year on year and confidence in the electoral process will fall further."
Voters in Northern Ireland have been asked twice since 2002 to secure their votes by completing forms issued to their homes by the Electoral Office.
Registration was introduced as part of overall measures to combat voting fraud.
However, an Electoral Commission report last December complained registration deterred those from a disadvantaged background, with those living in poorer areas and those with learning disabilities less likely to secure their vote.