All Victorians conceived by egg or sperm donation will from next year be able to discover the identity of their donor regardless of whether the donor wants to remain anonymous.

The legislative council passed a long-awaited amendment to the Assisted Reproductive Treatment Act on Tuesday night, which opens up access to information for donor-conceived Victorians regardless of when they were born.

People born people born before 1998 will now be able to access information about their donor.

The change comes into force on March 1, 2017 and will affect thousands of people born before 1998 who will be able to access information about their donor, including their name, date of birth or ethnic background, without the donor's consent.

Men who gave sperm donations before 1998 had done so believing their identity would be kept anonymous.