How do you get a marriage licence?

In Australia you do not need a marriage license.Your authorised marriage celebrant will give you a commemorative certificate on the day, then the celebrant registers your ceremony with BDM within 14 days of the marriage and after a lead time of approximately 28 days you will receive an official Marriage Certificate in the mail. 

Your celebrant will arrange the licence when they marry you

Hi, There -
I think there might be two parts to this question.
Firstly, in Australia, a "marriage licence" is more frequently known as a "Notice of Intended Marriage."
Obtaining a Notice of Intended Marriage is easy. 
Your Celebrant will be able to provide it, fill it out for you, and witness it. 
In order to complete a Notice of Intended Marriage, both parties planning to be married will be required to provide a few pieces of original documentation: Evidence of place and date of birth; photographic ID (a current passport will fulfill both of those requirements, or, if not a passport, a drivers licence and an original birth certificate); along with original divorce papers if that is also applicable.
A Notice of Intended Marriage must be lodged with an Authorised Celebrant no sooner than 18 months before the wedding date, and no later than one calendar month before the wedding day.

The second part of this question might relate to obtaining a certified copy of your marriage cerificate. This may be done by applying to the relevant Department of Births, Deaths, and Marriages in whichever state or territory in which the marriage took place.

In New South Wales, your Celebrant may apply for a certified copy of your marriage certificate when he or she registers your marriage.
I hope this helps to answer your question,  and please always feel free to get in touch with me if I may answer any other questions or concerns - there's no obligation and I'm always happy to help :-) .
Every best wish,

Jill

the other responses cover your query I believe.  In Australia we complete and sign a Notice of Intended Marriage.  

cheers

Lee Halligan

It is a little unclear whether you mean how do you get married and you mean the Notice of Intended Marriage or how you get your Marriage Certificate , on the basis that you mean your endorsed copy of your Marriage Certificate, the following applies.

Your Celebrant will discuss this with you.  Many Celebrants now register your wedding online with Births Deaths and Marriages and they can fill in the details of your application for your Marriage Certificate.  You will then receive an email from BDM confirming your application for your Marriage Certificate and asking you to pay the fee.  Once you have done this your Certificate will be mailed to you.  If your Celebrant does not register your marriage online, then they may be able to supply you with the application form and on this form you can provide your credit card details.  This application form is then posted to BDM and then when processed the Marriage Certificate will be posted to you.  Alternatively you can take the form to your local BDM office and apply in person.

As Rhyan said the legal requirement in Australia is the completion of the Notice or Intended Marriage at least one month but I earlier that 18 months before the planned ceremony date.

It depends what you are meaning. Getting a marriage licence to get married is an American legality of going to city hall where they issue the licence to get married within a period of time.

In Australian law, we have the Notice of Intended Marriage (NOIM) which is similar in that the identity, age and being able to marry are checked, usually by the celebrant. Couples need to do this a minimum of one month prior their marriage date and no more than 18 months prior.