1. Overview
You must apply for a Marriage Visitor visa if:
you want to get married or register a civil partnership in the UK
you want to give notice of a marriage or civil partnership in UK
you’re not planning to stay or settle in the UK after your marriage or civil partnership
you meet the other eligibility requirements
You don’t need a Marriage Visitor visa to convert your civil partnership into a marriage - you can apply for a Standard Visitor visa.
You can’t apply if you qualify for British citizenship - including if you can have dual nationality. You must apply for British citizenship instead.