| Competition: | Serie A1 |
| Season: | 2018–19 |
| Winners: | Pro Recco (33rd title) |
| Relegated: | Bogliasco Bene Nuoto Catania |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Pro Recco AN Brescia Sport Management |
| Continentalcup2: | Euro Cup |
| Continentalcup2 Qualifiers: | CN Posillipo CC Ortigia |
| League Topscorer: | Stefano Luongo (81 goals) |
| Prevseason: | 2017–18 |
| Nextseason: | 2019–20 |
The 2018–19 Serie A1 is the 100th season of the Serie A1, Italy's premier Water polo league.
The following 14 clubs compete in the Serie A1 during the 2018–19 season:
| bgcolor=dodgerblue align="center" colspan="17" | Serie A1 | ||||
| Team | City | Pool | Founded | Colours | |
|---|---|---|---|---|---|
| AN Brescia | Brescia | Centro natatorio Mompiano | |||
| Bogliasco | Bogliasco | Stadio del nuoto Gianni Vassallo | |||
| Canottieri | Naples | Piscina Circolo Canottieri Napoli | |||
| Catania | Catania | Piscina Comunale "F. Scuderi" | |||
| Florentia | Florence | Piscina Goffredo Nannini | |||
| Lazio | Rome | Stadio Olimpico del Nuoto | |||
| Ortiglia | Syracuse | Piscina Paolo Caldarella | |||
| Posillipo | Naples | Piscina "Alba Oriens" | |||
| Pro Recco | Recco | Piscina Comunale | |||
| Quinto | Genoa | Stadio del Nuoto di Albaro | |||
| Roma | Rome | Stadio Olimpico del Nuoto | |||
| Savona | Savona | Piscina Carlo Zanelli | |||
| Sport Management | Busto Arsizio | Piscine Manara | |||
| Trieste | Trieste | Polo Natatorio "Bruno Bianchi" |
| Team | Pld | W | D | L | GF | GA | Diff | Pts | Qualification | Head-to-head | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 26 | 25 | 0 | 1 | 347 | 155 | +192 | 75 | Qualification for the Playoffs | ||
| 2 | 26 | 24 | 0 | 2 | 399 | 135 | +264 | 72 | |||
| 3 | 26 | 22 | 0 | 4 | 337 | 185 | +152 | 66 | |||
| 4 | 26 | 13 | 4 | 9 | 232 | 215 | +17 | 43 | |||
| 5 | 26 | 11 | 2 | 13 | 212 | 246 | −34 | 35 | |||
| 6 | 26 | 11 | 1 | 14 | 210 | 231 | −21 | 34 | |||
| 7 | 26 | 10 | 1 | 15 | 189 | 279 | −90 | 31 | LAZ: 15 pts QUI: 7 pts FLO: 6 pts SAV: 4 pts | ||
| 8 | 26 | 10 | 1 | 15 | 199 | 255 | −56 | 31 | |||
| 9 | 26 | 10 | 1 | 15 | 212 | 258 | −46 | 31 | |||
| 10 | 26 | 9 | 4 | 13 | 154 | 225 | −71 | 31 | |||
| 11 | 26 | 9 | 2 | 15 | 207 | 264 | −57 | 29 | |||
| 12 | 26 | 9 | 1 | 17 | 217 | 291 | −74 | 27 | |||
| 13 | 26 | 5 | 1 | 20 | 194 | 274 | −80 | 16 | BOG - CAT: 17–11 CAT - BOG: 15–9 | ||
| 14 | 26 | 5 | 1 | 20 | 191 | 287 | −96 | 16 |
The final six was held on 23–26 May 2019 at the Bruno Bianchi Swimming Stadium in Trieste.
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| width=25 | Team | Qualification or Relegation | |
|---|---|---|---|
| Pro Recco | Champions League preliminary round | ||
| Champions League second qualifying round | |||
| Champions League first qualifying round | |||
| 4 | Euro Cup first qualifying round | ||
| 5 | CC Ortigia | ||
| 6 | AS Roma Nuoto |
| Rank | Player | Team | Goals | |
|---|---|---|---|---|
| 1 |  Stefano Luongo | Sport Management | 81 | |
| 2 | Pietro Figlioli | AN Brescia | 67 | |
| 3 | Gonzalo Echenique | Pro Recco | 59 | |
 Aleksandar Ivović | Pro Recco | 59 | ||
| 5 |  Steven Camilleri | Roma | 54 | |
| 6 | Francesco Di Fulvio | Pro Recco | 53 | |
| 7 | Robin Lindhout | Quinto | 48 | |
| 8 | Giacomo Lanzoni | Bogliasco | 47 | |
| Eduardo Campopiano | CC Napoli | 47 | ||
| 10 |  Draško Gogov | Trieste | 45 |