| Season: | 2005–06 |
| Matches: | 180 |
| Total Goals: | 494 |
| Nextseason: | 2006–07 |
The 2005–06 Austrian Football First League season was the 32nd season of second level league football in Austria. It was the fourth season that it used the name Red Zac First League.
1SC Bregenz resigned from the Bundesliga and were relegated to the Regionalliga. This left an extra place in the 1st Division which FC Kufstein filled.
| Club Name | Stadium | Capacity | |
|---|---|---|---|
| Austria Lustenau | Reichshofstadion | 12,500 | |
| FK Austria Wein Amateurs | Franz Horr Stadium | 11,800 | |
| DSV Leoben | Donawitz Stadium | 6,000 | |
| FC Gratkorn | Sportstadion Gratkorn | 3,000 | |
| FC Kärnten | Hypo-Arena | 32,000 | |
| FC Kufstein | Kufstein Arena | 4,500 | |
| Kapfenberger SV | Franz Fekete Stadion | 12,000 | |
| LASK Linz | Linzer Stadion | 14,000 | |
| SC Rheindorf Altach | Stadion Schnabelholz | 8,900 | |
| SC Schwanenstadt | Stadion Vor der Au | 5,000 |