Pro-gay marriage ministers from the Scottish National Party will announce legislation following the results of a consultation this week.
The Scottish cabinet is expected to discuss plans to legislate for same-sex marriage when it meets later.
SNP ministers, who favour the move, are due to announce legislation this week in the wake of a consultation which resulted in 80,000 responses.
The proposals, which would see Scotland become the first part of the UK to introduce the policy, have provoked opposition from some religious groups.
The Catholic Church and Church of Scotland strongly oppose the policy
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