The 1999 AAPT Championships was a men's ATP tennis tournament held in Adelaide, Australia and played on outdoor hardcourts. It was the 22nd edition of the tournament and was held from 4 to 11 January. Second-seeded Thomas Enqvist won his first title of the year and the 15th of his career.
| 1999 AAPT Championships | |
|---|---|
| Date | 4–11 January |
| Edition | 22nd |
| Category | World Series |
| Draw | 32S / 16D |
| Prize money | $325,000 |
| Surface | Hard / outdoor |
| Location | Adelaide, Australia |
| Champions | |
| Singles | |
 Thomas Enqvist | |
| Doubles | |
 Gustavo Kuerten /  Nicolás Lapentti | |
Finals edit
Singles edit
Thomas Enqvist defeated 
Lleyton Hewitt 4–6, 6–1, 6–2
- It was Enqvist's 1st singles title of the year and the 14th of his career.
Doubles edit
Gustavo Kuerten / Nicolás Lapentti defeated 
Jim Courier / Patrick Galbraith 6–4, 6–4