List of number-one singles of 2018 (Australia)

The ARIA Singles Chart ranks the best-performing singles in Australia. Its data, published by the Australian Recording Industry Association, is based collectively on the weekly physical and digital sales and streams of singles. In 2018, 13 singles have claimed the top spot, including Ed Sheeran's "Perfect", which started its peak position in 2017. Six acts, Ariana Grande, Ty Dolla Sign, Childish Gambino, Dean Lewis, George Ezra and Bradley Cooper, reached the top spot for the first time.