| Competition: | OB I |
| Season: | 1918 |
| Winners: | Ferencváros |
| Prevseason: | 1918 |
| Nextseason: | 1920 |
1919 Országos Bajnokság I (men's water polo) was the 13th water polo championship in Hungary. There were four teams who played one round match for the title.
| Team | M | W | D | L | G+ | G− | P | |
|---|---|---|---|---|---|---|---|---|
| 1. | Ferencvárosi TC | 3 | 3 | 0 | 0 | 16 | 5 | 6 |
| 2. | MAFC | 3 | 2 | 0 | 1 | 7 | 5 | 4 |
| 3. | III. ker. TVE | 3 | 1 | 0 | 2 | 10 | 13 | 2 |
| 4. | Nemzeti SC | 3 | 0 | 0 | 3 | 2 | 12 | 0 |
* M: Matches W: Win D: Drawn L: Lost G+: Goals earned G−: Goals got P: Point