| Competition: | Nemzeti Bajnokság I |
| Season: | 1998–99 |
| Winners: | MTK Budapest |
| Relegated: | Videoton Budapesti VSC III. Kerületi TVE |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | MTK Budapest |
| Continentalcup2: | UEFA Cup |
| Continentalcup2 Qualifiers: | Ferencváros Újpest |
| Continentalcup3: | Intertoto Cup |
| Continentalcup3 Qualifiers: | Vasas |
| League Topscorer: | Béla Illés (22) |
| Biggest Away Win: | Kispest 1–5 BVSC III. Kerület 1–5 MTK |
| Highest Scoring: | Győr 5–4 Diósgyőr |
| Matches: | 306 |
| Total Goals: | 859 |
| Prevseason: | 1997–98 |
| Nextseason: | 1999–2000 |
The 1998–99 Nemzeti Bajnokság I, also known as NB I for short, was the 97th season of top-tier football in Hungary. The league is officially named Professzionális Nemzeti Bajnokság (PNB) for sponsorship reasons. The season began on 24 July 1998 and ended on the weekend 16 June 1999. Újpest are the defending champions, having won their 20th Hungarian championship at the end of the 1998–99 season.
Tiszakécskei FC, Előre FC Békéscsaba and Stadler FC finished the 1997–98 season in the bottom three places of the table and thus were relegated to their respective NB II divisions. Békéscsaba ended a 6-year and Stadler 4-year stay in the top league, while Tiszakécske were relegated after just one year in the league.
| Club | Short name | City | Stadium | Capacity | |
|---|---|---|---|---|---|
| BVSC-Zugló FC | BVSC | Budapest | Szőnyi Street Stadium | 9,000 | |
| Debreceni VSC-Epona | Debrecen | Debrecen | Oláh Gábor utcai stadion | 9,640 | |
| Diósgyőri FC | Diósgyőr | Miskolc | DVTK Stadion | 11,300 | |
| Dunaferr SE | Dunaújvaros | Dunaújváros | Stadion Eszperantó Út | 12,000 | |
| Ferencvárosi TC | Ferencváros | Budapest | Albert Flórián Stadion | 18,100 | |
| Gázszer FC | Gázszer | Akasztó | Stadler Stadium | 12,000 | |
| Győri ETO FC | Győr | Győr | ETO Park | 16,000 | |
| Haladás | Szombathely | Rohonci úti stadion | 12,000 | ||
| III. Kerület FC-AT | III. Kerület | Budapest | Hévízi Street Stadium | 3,000 | |
| Honvéd | Budapest | Bozsik Stadion | 10,000 | ||
| MTK Hungária | MTK | Budapest | Hidegkuti Nándor Stadium | 12,700 | |
| Nyírség-Spartacus | Nyíregyháza | Nyíregyháza | Városi Stadion (Nyíregyháza) | 16,500 | |
| Siófok | Siófok | Révész Géza utcai stadion | 10,500 | ||
| Budapest | Szusza Ferenc Stadion | 13,500 | |||
| Vasas DH | Vasas | Budapest | Illovszky Rudolf Stadion | 12,000 | |
| Dunakanyar-Vác FC | Vác | Vác | Stadion Városi Vác | 10,500 | |
| Videoton FC | Videoton | Székesfehérvár | Sóstói Stadion | 15,000 | |
| Zalahús ZTE FC | ZTE | Zalaegerszeg | ZTE Aréna | 9,000 |
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Team | Manager | Captain | Kit manufacturer | Shirt sponsor | |
|---|---|---|---|---|---|
| BVSC |  |  | Nike | InterCity | |
| Debrecen | | | Adidas | Epona, MÁV Rt., OTP Bank | |
| Diósgyőr | | | Adidas | Borsod Brewery | |
| Dunaújváros | | | Umbro | Dunaferr | |
| Ferencváros | | Adidas | |||
| Gázszer | | | Diadora | ||
| Győr | | | Adidas | Rába | |
| Haladás | | | Hummel | Steffl Bier | |
| III. Kerület | | | Umbro | Auto Trader, Rocco Jeans | |
| Kispest | | | Umbro | Ibusz | |
| MTK | | | Nike | Fotex | |
| Nyíregyháza | | | Adidas | Taurus | |
| Siófok | | | Toti | ||
| Újpest | | | Joma | Espon | |
| Vasas | | | Lotto | Danubius Hotels | |
| Vác | | | Adidas | Zollner | |
| Videoton | | | Uhlsport | ||
| ZTE | | | Adidas | Zalahús |
| Team | Outgoing manager | Manner of departure | Date of vacancy | Position in table | Replaced by | Date of appointment |
|---|---|---|---|---|---|---|
| Haladás | László Dajka | Sacked | 17 September 1998 | 16th | István Mihalecz | 17 September 1998 |
| Videoton | Ferenc Csongrádi | Mutual agreement | 16 October 1998 | 14th | József Verebes | 16 October 1998 |
| Debrecen | András Herczeg | Sacked | 20 October 1998 | 13th | Lajos Garamvölgyi | 20 October 1998 |
| Ferencváros | Tibor Nyilasi | Mutual agreement | 17 December 1998 | 7th | Marijan Vlak | 29 December 1998 |
| III. Kerület | Ralf Wilhelms | Mutual agreement | 18 December 1998 | 16th | Lajos Schróth | 12 February 1999 |
| BVSC | István Sándor | Sacked | 22 December 1998 | 18th | Dragan Seklulić | 3 January 1999 |
| Diósgyőr | Barnabás Tornyi | Resigned | 5 January 1999 | 3rd | Gábor Szapor | 7 January 1999 |
| BVSC | Dragan Seklulić | Sacked | 10 February 1999 | 18th | József Tajti | 10 February 1999 |
| Diósgyőr | Gábor Szapor | Sacked | 14 April 1999 | 7th | Miklós Temesvári | 14 April 1999 |
| Siófok | László Nagy | Resigned | 4 May 1999 | 16th | József Mészáros | 4 May 1999 |
| Dunaújváros | Zoltán Varga | Resigned | 12 May 1999 | 6th | Ferenc Ebedli | 12 May 1999 |
It was contested by 18 teams, and MTK Hungária FC won the championship.
