The final ranking of 2012 was confirmed on Wednesday with Giovanni Trapattoni's mean suffering another drop
The Boys in Green suffered defeat in the recent friendly against Greece at the Aviva Stadium and the subsequent ranking release has confirmed the six-position drop from November's 36th place.
Giovanni Trapatoni's side have fallen a massive 19 places since January and now find themselves behind Egypt and Haiti, alongside Bolivia and Gabon on 609 ranking points.
A disappointing Euro 2012 and a 1-6 hammering at the hands of Germany contributed to Ireland's huge drop during the course of the year.
England remain sixth in the world while Scotland drop to 72nd and Wales fall to 82. Michael O'Neill's Northern Ireland climb four places to 96.
Spain, Germany and Argentina remain the top three ranked nations in the world while Colombia, behind Italy in fifth, earn the Fifa title of Mover of the Year, up from 36th in January.