The following article is based on a lecture the author gave at Gachon University College of Law on April 3, 2012. It mainly provides an overview on the central provisions against misleading advertising in German competition law, i.e. the law against unfair business practises. The form of the lecture manuscript has been retained. The references of the scientific literature were restricted to a necessary minimum in favour of the relevant case law of the German Federal Supreme Court (Bundesgerichtshof – BGH), the German Higher Regional Courts (Oberlandesgerichte – OLG) and the European Court of Justice (ECJ).