The court ruled that Taiwan's government must make the change within two years.
Gay marriage is currently legal in only around 20 countries around the world, 13 of which are in Europe.
Hundreds of thousands have gathered to demonstrate against legalising same-sex unions.
Says the seismic shocks were divine punishment for the offence to the family and the dignity of marriage
Malcolm Turnbul is in favour of a referendum on the issue instead of a parliamentary vote
'Mexican state must prevent discrimination for any motive and ensure equal rights to all' he says
Benhur Samson says he founded the agency in response to interest from clients
Australia has been criticised by international human rights groups over its slowness to act on same-sex marriage
The law comes into force six months after the country voted to allow gay unions in a historic referendum.