The 2005–06 Elitserien season was the 31st season of Elitserien. It ran from September 26, 2005 until March 6, 2006, with the Elitserien playoffs, the 82nd Swedish Championship, to April 18, with Färjestads BK taking the championship.
In the first round, the highest remaining seed chose which of the four lowest remaining seeds to be matched against. In the second round, the highest remaining seed was matched against the lowest remaining seed. In each round the higher-seeded team was awarded home ice advantage. Each best-of-seven series followed a 1–1–1–2–1–1 format: the higher-seeded team played at home for games 2 and 4 (plus 5 and 7 if necessary), and the lower-seeded team was at home for game 1, 3 and 6 (if necessary).