The 2018 Darwin Tennis International was a professional tennis tournament played on outdoor hard courts.

It was the fifth edition of the tournament and was part of the 2018 ITF Men's Circuit and the 2018 ITF Women's Circuit.

It took place in Darwin, Australia, on 24–30 September 2018.

The following players received a wildcard into the singles main draw: The following players received entry from the qualifying draw: The following player received entry as a lucky loser: The following players received a wildcard into the singles main draw: The following player received entry into the singles main draw by a special exempt: The following players received entry from the qualifying draw: