1998–99 Országos Bajnokság I (men's water polo)

1998–99 Országos Bajnokság I (men's water polo) was the 93rd water polo championship in Hungary.

First stage
Pld - Played; W - Won; L - Lost; PF - Points for; PA - Points against; Diff - Difference; Pts - Points.

Play-off
Tabán Trafik-Szegedi VE – OSC 10–6, 3–7, 9–8, 4–6, 10–3

ELTE-BEAC-Intruder – Tabán Trafik-Szegedi VE 10–5, 8–4, 9–8