| Competition: | Serie A |
| Season: | 1999–2000 |
| Dates: | 28 August 1999 – 14 May 2000 |
| Winners: | Lazio 2nd title |
| Relegated: | Torino Venezia Cagliari Piacenza |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Lazio Juventus Milan Internazionale |
| Continentalcup2: | UEFA Cup |
| Continentalcup2 Qualifiers: | Parma Roma Fiorentina |
| Continentalcup3: | Intertoto Cup |
| Continentalcup3 Qualifiers: | Udinese Perugia |
| League Topscorer: | Andriy Shevchenko (24 goals) |
| Matches: | 306 |
| Total Goals: | 764 |
| Prevseason: | 1998–99 |
| Nextseason: | 2000–01 |
The 1999–2000 Serie A (known as the Serie A TIM for sponsorship reasons) was the 98th season of top-tier Italian football, the 68th in a round-robin tournament. It was contested by 18 teams.
By late March, Juventus topped the table by nine points over Lazio with only eight games remaining, but they lost to Milan, to Lazio at the Stadio delle Alpi, and to Hellas Verona, with Lazio only dropping two points, against Fiorentina.[1] Lazio won the title on the final day of the season when Juventus lost their match against Perugia 1–0 on an almost flooded pitch, while Lazio comfortably beat Reggina 3–0 at home at the Stadio Olimpico.[1] [2]
Hellas Verona, Torino, Lecce and Reggina had been promoted from Serie B.
| Team | Head coach | Kit manufacturer | Shirt sponsor | |
|---|---|---|---|---|
| Bari |  Eugenio Fascetti | Lotto | TELE+ | |
| Bologna | Francesco Guidolin | Diadora | Granarolo | |
| Cagliari | Renzo Ulivieri | Biemme | Pecorino Sardo | |
| Fiorentina | Fila | |||
| Hellas Verona | Cesare Prandelli | Errea | Salumi Marsili | |
| Internazionale | Marcello Lippi | Nike | Pirelli | |
| Juventus | Carlo Ancelotti | Kappa | D+ | |
| Lazio |  Sven-Göran Eriksson | Puma | Cirio | |
| Lecce | Alberto Cavasin | Asics | Banca 121 | |
| Milan | Alberto Zaccheroni | Adidas | Opel | |
| Parma | Alberto Malesani | Champion | Parmalat | |
| Perugia | Carlo Mazzone | Galex | Perugina | |
| Piacenza | Maurizio Bragin | Lotto | Copra (H)/Gruppo DAC (A) | |
| Roma | Fabio Capello | Diadora | INA Assitalia | |
| Reggina | Franco Colomba | Asics | Caffè Mauro | |
| Torino | Emiliano Mondonico | Kelme | SDA Express Courier | |
| Udinese | Luigi De Canio | Diadora | Telit | |
| Venezia | Francesco Oddo | Kronos | Emmezeta |
Internazionale qualified to 2000–01 UEFA Champions League's third qualifying round, while Parma qualified to the 2000–01 UEFA Cup first round.
