The 2005–06 Irish Premier League was the 105th edition of the Irish League, the highest level of league competition in Northern Irishfootball, and the 3rd edition in its current format (as the Irish Premier League) since its inception in 2003. The league consisted of 16 teams, and Linfield won the championship.
Summary
Ards were relegated after finishing bottom of the table, and Institute were relegated after a 3-1 defeat on aggregate to Donegal Celtic in the promotion play-off.