In recent years, judicial and administrative authorities around the world, including several European countries, gradually began to be confronted with questions on the classification of platform workers. Brought before the (labor, civil, business, and social security) courts and taken up by labor inspectorates, tax and social security institutions, competition authorities and prosecutors, these questions have been answered in a variety of ways. Repeatedly, they have prompted courts to re-evaluate (core aspects of) the criteria traditionally used to distinguish between employees and self- employed. This contribution aims to give a comprehensive overview of this case law as of September 2021. It is based on the analysis of 175 judgments and administrative decisions in the fifteen European countries where platforms have so far been subject to such decisions: Austria, Belgium, Denmark, Finland, France, Germany, Ireland, Italy, Luxembourg, the Netherlands, Norway, Spain, Sweden, Switzerland, and the United Kingdom. A detailed overview of all the cases considered (including case numbers, dates, deciding bodies, links, outcomes, and the relevant legal reasoning) can be obtained from the author.