Political leaders have signed a pledge to support a campaign to legalise same-sex marriage.
Leaders of the Labour, Liberal Democrat, Green and Conservative parties signed up to the pledge at an event at Holyrood on Tuesday.
To mark the occasion, a specially created "equal marriage" cake was cut inside the Parliament.
Tom French, of organisers the Equality Network, said: "We agree with Alex Salmond's ambition to make Scotland a progressive beacon. The principles of equality and freedom of religion are surely integral to that.
"With the support of all opposition leaders and a clear majority of the public the Scottish Government now have all the backing they need to move forward with legislation."
The government has said it "tends towards the view" that same sex-marriage should be introduced but that faith groups and their celebrants should not be obliged to solemnise the ceremonies.
Scottish Labour leader Johann Lamont said: "As someone committed to creating a fairer, safer and more equal society, free from discrimination and bigotry, I am proud of Labour's action in government to tackle discrimination against LGBT people and in legislating to create civil partnerships."
Scottish Conservative leader Ruth Davidson said: "The Scottish Government will bring forward legislation on gay marriage in this parliament and I want to ensure we have a workable way of advancing this issue for the people of Scotland."
Lib Dem leader Willie Rennie said: "I want Scotland to be one of the most fair and progressive places in the world. Extending marriage equality to all is a really important part of that."
Green co-leader Patrick Harvie said: "I'm convinced that when MSPs have the chance to vote on this, Scotland will once again set the pace of change for the rest of the UK by backing equality for same-sex couples."
The Church of Scotland and the Catholic Church in Scotland, among others, are opposed to the proposals.
Cardinal Keith O'Brien, leader of the Catholic Church in Scotland, has said: "The proposal represents a grotesque subversion of a universally accepted human right, and I know I speak for many people of Scotland when I say that."