Polish dialects are regional vernacular varieties of the Polish language, and often show developments starting from an earlier stage of the language, often Old Polish or Middle Polish, namely the development of the so-called "pitched" or "slanted" vowels (Polish samogłoski pochylone).
Four major dialect groups (termed dialekt) are typically recognized, each primarily associated with a particular geographical region, and often further subdivided into dialects (termed gwara in Polish). They are:
Polish (endonym: język polski, [ˈjɛ̃zɨk ˈpɔlskʲi] , polszczyzna [pɔlˈʂt͡ʂɨzna] or simply polski, [ˈpɔlskʲi] ) is a West Slavic language of the Lechitic subgroup, within the Indo-European language family, and is written in the Latin script. It is primarily spoken in Poland and serves as the official language of the country, as well as the language of the Polish diaspora around the world. In 2024, there were over 39.7 million Polish native speakers. It ranks as the sixth-most-spoken among languages of the European Union. Polish is subdivided into regional dialects. It maintains strict T–V distinction pronouns, honorifics, and various forms of formalities when addressing individuals.
The traditional 32-letter Polish alphabet has nine additions (ą, ć, ę, ł, ń, ó, ś, ź, ż) to the letters of the basic 26-letter Latin alphabet, while removing three (x, q, v). Those three letters are at times included in an extended 35-letter alphabet. The traditional set comprises 23 consonants and nine written vowels, including two nasal vowels (ę, ą) denoted by a reversed diacritic hook called an ogonek. Polish is a synthetic and fusional language which has seven grammatical cases. It has fixed penultimate stress and an abundance of palatal consonants. Contemporary Polish developed in the 1700s as the successor to the medieval Old Polish (10th–16th centuries) and Middle Polish (16th–18th centuries).
The Old Polish language (Polish: język staropolski, staropolszczyzna) was a period in the history of the Polish language between the 10th and the 16th centuries. It was followed by the Middle Polish language.
The sources for the study of the Old Polish language are the data of the comparative-historical grammar of Slavic languages, the material of Polish dialects, several Latin manuscripts with Polish glosses, as well as – most importantly – monuments written in Old Polish: the Holy Cross Sermons (Polish: Kazania świętokrzyskie), the Sankt Florian Psalter (Psałterz floriański), Bogurodzica (Bogurodzica), the Bible of Queen Sophia (Biblia królowej Zofii, or Sárospatak Bible, Biblia szaroszpatacka) and some others.
Silesian, occasionally called Upper Silesian, is an ethnolect of the Lechitic group spoken in Upper Silesia. While having secured some international recognition as a language, there is a debate on whether Silesian is either a dialect of Polish or a distinct language, and if Silesians are either a regional ethnic group within the Polish nation or a distinct ethnic minority that historically emerged, but later diverged from, the Polish people. Some Silesians identify as a regional ethnic group within the Polish nation, while others view themselves as a distinct ethnic minority. Its vocabulary was significantly influenced by Central German due to the existence of numerous Silesian German speakers in the area prior to World War II and after. The first mentions of Silesian as a distinct lect date back to the 16th century, and the first literature with Silesian characteristics to the 17th century.
Linguistic distinctiveness of Silesian has long been a topic of discussion among Poland's linguists, especially after all of Upper Silesia was included within the Polish borders following World War II. Some regard it as one of the four major dialects of Polish, while others classify it as a separate regional language, distinct from Polish. The dispute over the status of Silesian is considered to be of purely political character. According to the official data from the 2021 Polish census, 467 145 people use Silesian on daily basis. Internationally, Silesian has been fully recognized as a language since 2007, when it was accorded the ISO 639-3 registration code szl.