1998–99 Országos Bajnokság I (men's water polo) was the 93rd water polo championship in Hungary.
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 This article about a water polo competition in Hungary is a stub.
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