Gay rights activists say they cannot afford to be complacent if they want to win the marriage equality referendum next year.

The public will be asked if the Constitution should be changed to allow same-sex marriage in 2015, but equality groups are warning that decisions are made by those who turn up to vote.

A recent poll suggests that three quarters of voters are in favour of the changes and the Yes Equality campaign being launched today will encourage people to make sure they are registered to have their say.

The group consists of the Gay and Lesbian Equality Network (GLEN), the Irish Council for Civil Liberties (ICCL) and Marriage Equality.

the campaign will run until Tuesday November 25th - the deadline for signing up to the 2015 Register of Electors.

Ahead of the launch, Tiernan Brady of the Yes Equality campaign, said: "The upcoming referendum on equal access to civil marriage is a once-in-a-generation moment."

"Whilst the polls are very positive we cannot afford to be complacent. Decisions are made by people who turn up to vote. We encourage everybody to make their voice heard and change Ireland for the better for everyone by registering to vote," he added.

Monnine Griffith of the Marriage Equality group says it is easy to check and see if you are registered.