The country's first public civil partnerships for same-sex couples are taking place today.
Two couples will hold ceremonies in the capital this afternoon after the law was changed in January.
It means lesbian and gay couples can now benefit from improved rights, similar to those enjoyed by married people, in areas including tax, social welfare and property.
“The first public civil partnership ceremonies in Ireland mark another great milestone for Ireland and for lesbian and gay people,” said Kieran Rose, chair of the Gay and Lesbian Equality Network.
“It is a great day for the two couples, their families and friends, and we wish them much luck and happiness.
“Lesbian and gay couples have been waiting for years to have their relationships recognised and protected by the State. For the two couples today and all those who will enter civil partnerships over the coming months, this is a very significant advance.”