The current lichen checklist of Poland contains 1687 species and more than a dozen subspecies. At the same time, as a result of detailed analyses, as many as 130 species from the earlier lists of lichens of Poland (Fałtynowicz 2003, Fałtynowicz & Kossowska 2016) have been excluded; they were incorrectly reported from the country, or were found to have a negligible probability of occurrence, or the lack of herbarium specimens makes it impossible to verify the correctness of the designations. The present list includes lichen-forming fungi and does not include lichenicolous and lichen-allied fungi, the most comprehensive list of which is in a work by Czyżewska and Kukwa (2009); that publication is in urgent need of supplementation, as numerous new species have been found in the country in more recent years (cf. Czyżewska 2020). The present checklist is based primarily on literature data published up to and including the year 2022; the reference list contains about 1800 items. Unpublished data available in dozens of masters and doctoral theses, various reports, as well as several articles submitted for publication in 2023, were also used. With a few exceptions, the checklist authors did not verify herbarium collections; instead, references to voucher specimens are provided in monographic works on selected genera: Umbilicaria (Krzewicka 2004a), Micarea (Czarnota 2007), Ochrolechia (Kukwa 2011), Porpidia (Jabłońska 2012), Verrucaria (Krzewicka 2012), Stereocaulon (Oset 2014), Opegrapha (Wieczorek 2018) and Parmelia (Ossowska 2021). In addition to the Polish herbaria, the largest collection of lichens from the country, including duplicates of some published records, can be found in the following European herbaria: the Berlin Herbarium (B), Herbarium der Universität Greifswald (GFW), World Museum Liverpool Herbarium (LIV), Charles University in Prague Herbarium (PRC), Uppsala University Herbarium (UPS), Naturhistorisches Museum Wien Herbarium (W) and Universität Wien Herbarium (WU). We note, however, that most of these collections require critical revision.