2018 FFA Cup preliminary rounds

The 2018 FFA Cup preliminary rounds was the qualifying competition to decide 21 of the 32 teams which took part in the 2018 FFA Cup Round of 32, along with the 10 A-League clubs and reigning National Premier Leagues champion, Heidelberg United. The preliminary rounds operated within a consistent national structure whereby club entry into the competition was staggered in each federation, with the winning clubs from Round 7 of the preliminary rounds in each member federation gaining entry into the Round of 32. All Australian clubs were eligible to enter the qualifying process through their respective FFA member federation, however only one team per club was permitted entry in the competition.