A Sunday Tribune/Millward Browne opinion poll to be published tomorrow shows that almost two-thirds of those surveyed are in favour of gay and lesbian couples having the same legal and financial rights as married couples.
Support is highest among women and among those in the 18 to 35 age group.
But the survey also shows that 50% of people questioned are against allowing same sex couples to legally adopt children.
37% said they were in favour of such a move.