| Competition: | Nemzeti Bajnokság I |
| Season: | 2009–10 |
| Dates: | 24 July 2009 – 23 May 2010 |
| Winners: | Debrecen |
| Relegated: | Nyíregyháza Diósgyőr |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Debrecen |
| Continentalcup2: | Europa League |
| Continentalcup2 Qualifiers: | Videoton Győr Zalaegerszeg |
| League Topscorer: | Nemanja Nikolic (18) |
| Biggest Home Win: | Kecskemet 5–1 Vasas Nyíregyháza 5–1 Vasas MTK Hungária 4–0 Kaposvár Debreceni VSC 5–1 Kaposvár |
| Biggest Away Win: | Nyíregyháza 0–4 Zalaegerszegi |
| Highest Scoring: | Kecskemet 3–6 Fehérvár MTK Hungária 4–5 Újpest FC |
| Matches: | 240 |
| Total Goals: | 706 |
| Longest Wins: | Debrecen (8 games)[1] |
| Longest Unbeaten: | Videoton (19 games) |
| Longest Winless: | Nyíregyháza (12 games) |
| Longest Losses: | Diósgyőr, Kaposvár (6 games each) |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
The 2009–10 Nemzeti Bajnokság I, also known as NB I, was the 108th season of top-tier football in Hungary. The league was officially named Soproni Liga for sponsorship reasons. The season began on 24 July 2009 and ended on 23 May 2010. Debrecen were the defending champions, and they defended their title.
BFC Siófok and Rákospalotai EAC finished the season in the last two places and thus were relegated to their respective NB II divisions. Siófok ended a two-year stint in Hungary's highest football league while Rákospalota were relegated after four years.
Promotion to the league was achieved by the champions of the NB II Eastern Division, Ferencvárosi TC and by the runners-up of the Western Division, Lombard-Pápa TFC. Both teams return to the National Division after three-year absences. Lombard-Pápa capitalized on the denial of a NB I license for Western Division champions Gyirmót SE.[2]
Debreceni VSC won their fifth title in six years, and their third under András Herczeg. The club started off the season by losing their first league game since March, after a 1-0 defeat at Diósgyőr. DVSC then went on an 8-game winning streak, but lost three consecutive games in October including a 3-0 defeat to title-contenderd Videoton, and were placed second, 2 points off of Videoton by half-time. The club from Fehérvár only suffered two losses throughout the autumn part of the campaign, and went on an 18-game unbeaten run in the league.
MTK ended Videoton's unbeaten streak in May, defeating them 1-0 in Fehérvár. The following week Debrecen defeated Videoton 3-2, and were 6 points clear off of their western counterparts, with three games to go. Some hope was restored in Vidi's title-aspirations, as DVSC suffered a 2-1 loss at Újpest in Gameweek 28, while Videoton shut out Vasas 3-0. Going into the last gameday, the teams were just separated by just one point. Videoton lost in their arch-rivals' home, as Győri ETO beat them 1-0, meaning that despite DVSC's defeat at Kecskemét of the same scoreline, the railway team successfully defended their championship.
| Team | Chairman | Head Coach | Kitmaker | Shirt sponsor | |
|---|---|---|---|---|---|
| Budapest Honvéd |  George F. Hemingway |  Tibor Sisa | Nike | ||
| Debreceni VSC | Sándor Szilágyi | András Herczeg | adidas | Teva | |
| Diósgyőri VTK | Imre Dlusztus | Zoltán Aczél | Erreà | Jánosik és TSA. | |
| Videoton FC | Sándor Berzi | György Mezey | Nike | Máltai Szeretetszolgálat | |
| Ferencváros | Bobby Davison | Nike | Unibet | ||
| Győri ETO | Csaba Tarsoly | adidas | Quaestor | ||
| Kaposvári Rákóczi FC | Kálmán Torma | László Prukner | Givova | Regáli Klíma | |
| Kecskeméti TE | Pál Rózsa, János Versegi | Aurél Csertői | Jako | Ereco | |
| Lombard-Pápa | Péter Bíró | György Véber | Jako | Lombard | |
| MTK Hungária FC | László Domonyai | József Garami | Nike | fotex | |
| Nyíregyháza Spartacus | Ferenc Karakó | Lázár Szentes | Jako | ||
| Paksi SE | János Süli | Imre Gellei | Jako | MvM Paksi Atomerőmű | |
| Szombathelyi Haladás | Béla Illés | Antal Róth | Legea | Contact Zrt. | |
| Újpest FC | István Csehi | Willie McStay | Puma | Birdland Golf & SPA Resort | |
| Vasas SC | János Jámbor | Géza Mészöly | Lancast | ||
| Zalaegerszegi TE | Ferenc Nagy | János Csank | mass |
| Team | Outgoing manager | Manner of departure | Date of vacancy | Replaced by | Date of appointment | |
|---|---|---|---|---|---|---|
| Budapest Honvéd | Tibor Sisa | 23 October 2009 | ||||
| Ferencvárosi TC | Bobby Davison | Sacked | 30 October 2009 | Craig Short | 30 November 2009 |
Including matches played on 18 May 2010; Source: MLSZ (Click on "Góllövő lista")
| Rank | Scorer | Club | Goals |
|---|---|---|---|
| 1 | Kaposvári Rákóczi FC / Videoton FC | 18 | |
| 2 | Videoton FC | 15 | |
| 3 | Újpest FC | 14 | |
| Zalaegerszegi TE | 14 | ||
| Debreceni VSC | 14 | ||
| 6 | Vasas SC | 13 | |
| 7 | Tibor Montvai | Kecskeméti TE | 12 |
 Tarmo Kink | Győri ETO | 12 | |
| 9 | Attila Tököli | Paksi SE | 11 |
| 10 |  Fouad Bouguerra | Nyíregyháza Spartacus | 10 |
| Péter Czvitkovics | Debreceni VSC | 10 |