Never.
Neither the Republic of Ireland nor Northern Ireland have ever won the World Cup. The best performance was by the Republic of Ireland in 1990 when they reached the quarter-finals, where they were beaten by Italy (the hosts).
You have not specified any sport, so your question could refer to anything. Given that the FIFA World Cup is about to start at the time of asking of the question, the Republic of Ireland first qualified for the World Cup Finals in 1990. They did so again in 1994 and 2002.
Canada did not qualify for the 2014 World Cup finals.
No, Ireland failed to qualify for the 2014 FIFA World Cup.
Ireland failed to qualify for the FIFA 2014 World Cup in Brazil.
They are not in the 2014 FIFA World Cup finals, but did qualify for the 1982 and 2010 finals.
Ireland have participated in the FIFA World Cup finals three times, making it as far as the quarter finals on one occasion; 1990 - Quarter Finals 1994 - Round 2 2002 - Round 1
All-Ireland Finals!!
Yes, they reached the quarter finals.
The Republic of Ireland have qualified for the FIFA World Cup three times - 1990, 1994, and 2002.Northern Ireland have also qualified three times - 1958, 1982 and 1986.
The Republic of Ireland are not at the World Cup 2010.
No. Spain and France both qualified from Group I to get to the World Cup finals. Although Spain were the 2010 champions, they did have to qualify for the 2014 finals.