The Division of Macarthur is an Australian electoral division in the state of New South Wales.

John Macarthur was a British Army officer, entrepreneur, landowner and politician who was a highly influential figure in the establishment of the colony of New South Wales. He was also a pioneer of the Australian Merino wool industry, and was instrumental in agitating for, and organising, a rebellion against Governor William Bligh in what is now termed as the Rum Rebellion in January 1808.