Macarthur Square is a large shopping centre on the southern side of Campbelltown, New South Wales, Australia. The shopping centre was opened by the Lend Lease Corporation and GPT on 29 August 1979. The shopping centre is situated adjacent to Macarthur Railway Station, where trains terminate on the Airport, Inner West & South Line. An A$160 million expansion in 2005, which expanded the centre's floor area from 29,000m2 to 90,0002, saw Macarthur Square become one of the largest shopping complexes in Sydney.