Polish (Język polski, polszczyzna) is a West Slavic language and the official language of Poland. Its written standard is the Polish alphabet which corresponds basically to the Latin alphabet with a few additions. Polish-speakers use the language in a uniform manner throughout most of Poland.

Despite the pressure of non-Polish administrations in Poland, who have often attempted to suppress the Polish language, a rich literature has developed over the centuries and the language is currently the largest in terms of speakers of the West Slavic group. It is also the third most widely spoken Slavic language, after Russian and Ukrainian.

Nearly 97% of Poland's citizens declare Polish as their mother language. Ethnic Poles constitute significant minorities in Lithuania, Belarus, and Ukraine. Polish is the most widely used minority language in Lithuania's Vilnius County (26% of the population, according to the 2001 census results), and it is also present in other counties. In Ukraine, Polish can often be heard in the cities of Lviv and Lutsk. Western Belarus has a significant Polish minority, particularly in the Brest and Grodno regions.

In the United States, it is estimated that citizens of Polish ethnic extraction number more than 11 million, but many no longer speak Polish fluently. According to the United States 2000 Census, 667,414 Americans of age 5 years and over reported Polish as the language spoken at home: about 1.4% of people who speak languages other than English, or 0.25% of the U.S. population. The largest concentrations of Polish speakers reported in the census (over 50%) occur in three states: Illinois (185,749), New York (111,740) and New Jersey (74,663).

Canada has a large Polish Canadian population. The 2006 census recorded 242,885 speakers of Polish, with a significant concentration in the city of Toronto, Ontario (91,810 speakers).