Trade Union Density rose 0% to in Ireland in 2015, according to OECD.
Historically, Trade Union Density in Ireland reached an all time high of 54.8% in 1978 and an all time low of 29.6% in 2013.
| Trade Union Density | Unit | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
| Australia | % | 18.5% | 18.6% | 19.3% | 18.4% | 18.5% | ||||||||||||||||
| Belgium | % | 54.7% | 54.4% | 54.9% | 53.8% | 55.1% | ... | |||||||||||||||
| Canada | % | 27.3% | 27.1% | 27.3% | 27.4% | 27.1% | ||||||||||||||||
| Denmark | % | 67.9% | 66.3% | 67.7% | 67.0% | 66.4% | ||||||||||||||||
| France | % | 7.55% | 7.57% | 7.68% | 7.74% | 7.72% | ... | |||||||||||||||
| Germany | % | 19.9% | 19.1% | 18.9% | 18.6% | 18.0% | ||||||||||||||||
| Iceland | % | 87.1% | 79.3% | 83.7% | 84.4% | 84.0% | ... | |||||||||||||||
| Ireland | % | 31.5% | 31.9% | 33.1% | 32.7% | 32.6% | ||||||||||||||||
| Italy | % | 33.5% | 33.4% | 34.7% | 35.5% | 35.7% | ||||||||||||||||
| Mexico | % | 16.8% | 15.7% | 15.3% | 14.4% | 14.5% | ||||||||||||||||
| Norway | % | 53.0% | 52.6% | 53.6% | 53.7% | 53.5% | ||||||||||||||||
| Spain | % | 15.7% | 17.4% | 17.8% | 17.6% | 17.2% | ... | |||||||||||||||
| Sweden | % | 70.8% | 68.3% | 68.4% | 68.2% | 67.5% | ||||||||||||||||
| USA | % | 11.6% | 11.9% | 11.8% | 11.4% | 11.3% | ||||||||||||||||
| United Kingdom | % | 27.9% | 27.1% | 27.1% | 26.4% | 25.6% |
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