A marriage celebrant can only marry you after an Authorised Person has witnessed your NoIM.
Who is an Authorised Person?
Before your marriage celebrant ( or the Marriage Registry Office) can marry you, you need to complete a Notice of Intended Marriage (NoIM) form.
This form needs to be witnessed by an Authorised Person before it can be lodged with your marriage celebrant.
Below are a list of Authorised Persons
(a) if a party signs the Notice in Australia—an authorised Celebrant, a Commissioner for Declarations under the Statutory Declarations Act 1959, a Justice of the Peace, a barrister or solicitor, a legally qualified medical practitioner (these include medical doctors & dentists only - not Registered Nurses), or a member of the Australian Federal Police or the police force of a State or Territory;
Suggestion: Police Office. All you need to do is visit any police station and they will be able to witness your signature.
NB. Authorised Persons who can witness DO NOT include: Pharmacists and Registered Nurses.
(b) if a party signs the Notice outside Australia — an Australian Consular Officer, an Australian Diplomatic Officer, a notary public, an employee of the Commonwealth authorised under paragraph 3(c) of the Consular Fees Act 1955, or an employee of the Australian Trade Commission authorised under paragraph 3(d) of the Consular Fees Act 1955. Note: For the definitions of Australian Consular Officer and Australian Diplomatic Officer, see section 2 of the Consular Fees Act 1955