Through this bachelor thesis it has been shown that a high degree of trade unionisation in acountry does not lead to gender equality in wage. This result was found through regressionanalysis and hypothesis testing. The analyzes were performed on a dataset containing datafrom two countries regarding wage, age, gender and degree of trade unionisation. Norway wasconsidered as the country with high degree of trade unionisation and USA as the country witha low degree. People living in Norway, a country with a high degree of trade unionisation, earn$1.388 more than the people in USA. Despite this, it was discovered that the difference in wagebetween the sexes is larger in Norway than in USA. This result was unexpected based on whatone knows about trade unions and what they work towards. The source of error leading to thisresult might be that the observations from USA have not entered their exact wage. The selectionsize which has stated their wage is also different for the two countries, which may be an errorsource.