The 1999 FIA GT Homestead 3 Hours was the eighth round the 1999 FIA GT Championship season. It took place at the Homestead-Miami Speedway, Florida, United States, on September 26, 1999.
This event was originally intended to share the weekend with a United States Road Racing Championship event. However, the USRRC championship was cancelled midway through the season, leaving the FIA GT Championship to run on their own. In order to increase the number of participants for the FIA GT event, as well as to allow USRRC teams to compete, a National GT (N-GT) designation was used for cars which had run in the USRRC's GT2 and GT3 classes. This would be the first time the FIA GT Championship used two classes of cars since the end of the 1998 season, and the cancellation of GT1.
Cars running in the N-GT class would not be eligible for points in the FIA GT Championship.
Class winners are in bold. Cars failing to complete 70% of winner's distance are marked as Not Classified (NC).
| Pos | Class | No | Team | Drivers | Chassis | Tyre | Laps |
|---|---|---|---|---|---|---|---|
| Engine | |||||||
| 1 | GT | 21 |  Paul Belmondo Racing | Paul Belmondo Emmanuel Clérico | Chrysler Viper GTS-R | 122 | |
| Chrysler 8.0L V10 | |||||||
| 2 | GT | 1 | Viper Team Oreca |  Olivier Beretta Karl Wendlinger | Chrysler Viper GTS-R | 122 | |
| Chrysler 8.0L V10 | |||||||
| 3 | GT | 18 |  Chamberlain Motorsport | Xavier Pompidou Hans Hugenholtz Vincent Vosse | Chrysler Viper GTS-R | 121 | |
| Chrysler 8.0L V10 | |||||||
| 4 | GT | 2 | Viper Team Oreca | Jean-Philippe Belloc David Donohue | Chrysler Viper GTS-R | 120 | |
| Chrysler 8.0L V10 | |||||||
| 5 | GT | 15 |  Freisinger Motorsport | Bob Wollek Wolfgang Kaufmann | Porsche 911 GT2 | 119 | |
| Porsche 3.6L Turbo Flat-6 | |||||||
| 6 | GT | 16 | Freisinger Motorsport | Manfred Jurasz Lance Stewart | Porsche 911 GT2 | 116 | |
| Porsche 3.6L Turbo Flat-6 | |||||||
| 7 | N-GT | 17 | Schumacher Racing | Larry Schumacher Cort Wagner John O'Steen | Porsche 911 GT2 | 116 | |
| Porsche 3.6L Turbo Flat-6 | |||||||
| 8 | GT | 19 | Chamberlain Motorsport | Christian Vann Christian Gläsel | Chrysler Viper GTS-R | 116 | |
| Chrysler 8.0L V10 | |||||||
| 9 | GT | 8 |  Elf Haberthur Racing |  Luca Cappellari Paolo Rapetti Patrick Vuillaume | Porsche 911 GT2 | 113 | |
| Porsche 3.6L Turbo Flat-6 | |||||||
| 10 | GT | 7 | Konrad Motorsport | Charles Slater Ugo Colombo | Porsche 911 GT2 | 113 | |
| Porsche 3.6L Turbo Flat-6 | |||||||
| 11 | N-GT | 12 | Bell Motorsport | Ron Johnson Scott Neuman Andy Pilgrim | BMW M3 | ? | 112 |
| BMW 3.2L I6 | |||||||
| 12 | N-GT | 40 | Aspen Knolls Racing | Shane Lewis Bob Mazzuoccola | BMW M3 | 102 | |
| BMW 3.2L I6 | |||||||
| 13 DNF | GT | 6 | Konrad Motorsport | Franz Konrad Mike Hezemans | Porsche 911 GT2 | 67 | |
| Porsche 3.6L Turbo Flat-6 | |||||||
| 14 DNF | GT | 9 | Elf Haberthur Racing | Mauro Casadei Andrea Garbagnati | Porsche 911 GT2 | 50 | |
| Porsche 3.6L Turbo Flat-6 | |||||||
| 15 DNF | GT | 22 | Paul Belmondo Racing | Marc Rostan "Rael" | Chrysler Viper GTS-R | 49 | |
| Chrysler 8.0L V10 | |||||||
| 16 DNF | N-GT | 39 | Mosler Automotive |  João Barbosa James Ruffier Loïc Depailler | Mosler Intruder | ? | 24 |
| Chevrolet 5.7L V8 | |||||||
| 17 DNF | N-GT | 14 | NP Racing | Bret Parker Kevin Allen | Dodge Viper GTS-R | ? | 4 |
| Dodge 8.0L V10 |