Analyst: LGBT marriage vote is 'significant step' for Greece

STORY: Koliastasis added the passing of the law could be a politically risky move in Greece, where the population remains split on support.

The powerful Orthodox Church, which believes homosexuality is a sin, has also strongly opposed the bill.

Although some members of Mitsotakis' center-right New Democracy party are expected to abstain or vote against the bill, he is expected to gain enough support from leftist opposition parties.

LGBT+ groups have been pushing for reform for decades.

In 2008, a lesbian and a gay couple defied the law and tied the knot on a tiny Greek island, but the weddings were later annulled by a top court.

Since then, Greece has passed LGBT+ reforms, allowing civil partnership among same-sex couples in 2015 and the legal recognition of gender identity in 2017.