| Competition: | Nemzeti Bajnokság I |
| Season: | 2005–06 |
| Dates: | 30 July 2005 – 3 June 2006 |
| Winners: | Debrecen |
| Relegated: | Lombard Pápa Ferencváros |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Debrecen |
| Continentalcup2: | UEFA Cup |
| Continentalcup2 Qualifiers: | Újpest Videoton |
| Continentalcup3: | Intertoto Cup |
| Continentalcup3 Qualifiers: | Sopron |
| League Topscorer: | Péter Rajczi (23) |
| Biggest Home Win: | MTK 7–0 Lombard Pápa Újpest 7–0 Honvéd |
| Biggest Away Win: | Lombard Pápa 0–5 Tatabánya |
| Highest Scoring: | MTK 6–3 Zalaegerszeg |
| Matches: | 240 |
| Total Goals: | 707 |
| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |
The 2005–06 Nemzeti Bajnokság I, also known as NB I, was the 104th season of top-tier football in Hungary. The league was officially named Borsodi Liga for sponsoring reasons. The season started on 30 July 2005 and ended on 2 June 2006.
