Hundreds of LGBT rights supporters have rallied outside Taiwan's parliament ahead of a crucial parliamentary vote on Friday.
It involves a 2017 ruling by the constitutional court which said the civil code not allowing same-sex marriage was unconstitutional.
Lawmakers have begun efforts to reconcile 3 competing bills on same-sex marriage that will determine how same-sex relationships are defined in the future.
One of the bills proposes same-sex marriage to be legalized under a separate law. The other two offer fewer protections and do not recognize gay partners as spouses.
A female protester said: "If the parliament version of the law does not pass, I think it will be a step backward for our democratic society. I came here today to show my solidarity."
A male protester said: "We want to become the first country in Asia that legalizes same-sex marriage. I hope this bill passes and we can move forward."
Legalization of same-sex marriage has become a complex issue in Taiwan after voters opposed marriage equality in a series of referendums last November.