Nine people have submitted formal objections to the marriage of Prince Charles and Camilla Parker Bowles.
The wedding is due to take place on 8 April in Windsor Guildhall
The details have been sent to the office of the Registrar General who will decide whether they are valid.
No certificate of marriage can be issued until all objections have been dealt with.
BBC Royal Correspondent June Kelly said a decision is likely to be made next week. The wedding is set to take place at Windsor Guildhall on 8 April.
Those who are opposed to the marriage can seek a judicial review in the High Court if the Registrar General does not deem their objections to be valid.
The objections, which are formally known as caveats, were lodged at the local registry offices at Chippenham and Cirencester where the couple have their homes.
Ms Kelly said some of the objections were likely to stem from questions over the legality of a royal marrying in a civil ceremony.
"The big problem for the royals is if any of these people decides to take the matter further in the courts because that really could stir things up," said Ms Kelly, who pointed out that the wedding date is only a few weeks away.
The objections are the latest in a string of problems to disrupt the wedding plans.
The Queen revealed that she would stay away from the marriage, prompting Clarence House to insist that the move was not intended to be a snub.
The Duke of Edinburgh will also not attend the civil ceremony in Windsor's Guildhall.
Concerns have been raised over whether a member of the Royal Family can in fact marry in a civil ceremony.
However, the Lord Chancellor, Lord Falconer, said he was satisfied that the marriage would be legal.
The marriage ceremony was to have been held at Windsor Castle but was later switched amid concerns over the licence.
Apparently, royal aides failed to realise the licence required would have run for three years, meaning anyone could apply to marry there during that time.
The deadline for objections has now passed.