The 2015 City of Onkaparinga ATP Challenger was a professional tennis tournament played on hard courts. It was the first edition of the tournament which was part of the 2015 ATP Challenger Tour. It took place in Happy Valley, Australia between 3–11 January 2015.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Blaž Rola | 80 | 1 | ||
 Cyprus | Marcos Baghdatis | 85 | 2 | |
 Russian Federation | Andrey Kuznetsov | 92 | 3 | |
 France | Paul-Henri Mathieu | 97 | 4 | |
 Ukraine | Aleksandr Nedovyesov | 129 | 5 | |
 Japan | Hiroki Moriya | 146 | 6 | |
| Michael Russell | 159 | 7 | ||
 Hungary | Márton Fucsovics | 162 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Andrew Whittington
Maxime Authom Andrew Harris Jacob GrillsThe following players received entry as a lucky loser:
Ryan Harrison def. Marcos Baghdatis, 7–6(10–8), 6–4See main article: 2015 City of Onkaparinga ATP Challenger – Doubles.
Andrey Kuznetsov / 
Aleksandr Nedovyesov def. Alex Bolt / Andrew Whittington, 7–5, 6–4