The Chamber of Deputies voted 56-4 to adopt the bill, which is said to be part of the most fundamental rewrite of Luxembourg's laws on marriage since 1804. Its website said the new rules could take effect in early 2015, or six months after their official publication.
The Human Rights Campaign, a US-based organisation in favour of lesbian, gay, bisexual and transgender rights, said yesterday's vote makes Luxembourg the world's 19th nation to grant "full marriage rights" to all of its citizens.