| Date: | 24–30 September |
| Edition: | 5th |
| Category: | ITF Men's Circuit ITF Women's Circuit |
| Location: | Darwin, Australia |
| Prize Money: | $25,000 (men) $60,000 (women) |
| Champms: |  Yuta Shimizu |
| Champws: |  Kimberly Birrell |
| Champmd: | Jeremy Beale / Thomas Fancutt |
| Champwd: |  Rutuja Bhosale / Hiroko Kuwata |
| Before Year: | 2011 |
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.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Australia | Olivia Rogowska | 162 | 2 | |
| Australia | Arina Rodionova | 168 | 1 | |
| Australia | ||||
| Australia | Jaimee Fourlis | 190 | 4 | |
 Korea, Republic of | Jang Su-jeong | 204 | 5 | |
 United Kingdom | Katy Dunne | 226 | 6 | |
| Japan | Eri Hozumi | 241 | 7 | |
| Australia | Destanee Aiava | 247 | 8 |
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:
Marianna Zakarlyuk| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Japan | Yuta Shimizu | 407 | 2 | |
| Australia | Jeremy Beale | 497 | 1 | |
| Australia | Thomas Fancutt | 571 | 3 | |
| United Kingdom | Brydan Klein | 635 | 4 | |
| Australia | Michael Look | 644 | 5 | |
| United Kingdom | Evan Hoyt | 693 | 6 | |
| Australia | Jacob Grills | 746 | 7 | |
 New Zealand | Rhett Purcell | 753 | 8 |
The following players received a wildcard into the singles main draw:
Ken Cavrak Alexander Crnokrak Jesse Delaney Mustafa IbraimiThe following player received entry into the singles main draw by a special exempt:
Jayden CourtThe following players received entry from the qualifying draw:
David Barclay Corey Gaal
Christian Langmo Winter Meagher Masayoshi Ono
Vincent Stouff Jacob Sullivan Socrates Leon TsoronisSee main article: 2018 Darwin Tennis International – Women's singles.
Kimberly Birrell def. Ellen Perez, 6–3, 6–3 Yuta Shimizu def. Evan Hoyt, 7–6(8–6), 3–6, 6–4See main article: 2018 Darwin Tennis International – Women's doubles.
Rutuja Bhosale / Hiroko Kuwata def. Kimberly Birrell / Katy Dunne, 6–2, 6–4 Jeremy Beale / Thomas Fancutt def. Brydan Klein / Scott Puodziunas, 7–6(7–4), 6–3