While the retroflexion of Polish sibilants is not a newly discovered feature, it is nevertheless not yet very popular in the Polish-language literature. The purpose of this article is to provide detailed articulatory evidence for the retroflex character of Polish consonants [ʂ ʐ ʈ͡ʂ ɖ͡ʐ]. A new aspect of this approach is the use of instrumental techniques based on electromagnetic articulography, which has been used in a historically largest group of carefully selected speakers. The articulatory features of Polish retroflex sibilants were distinguished. Those features also represent the classification criteria of this group of consonants. The analysis of articulatory data made it possible to describe the articulatory characteristics of Polish retroflex sibilants present in the majority of the realisations, such as apicality, (post)alveolarity, the presence of the sublingual cavity and tongue retraction.