Pączki (Polish [ˈpɔnt​͡ʂki] ( listen)) are pastries traditional to Polish cuisine (the word pączek is sometimes translated as doughnut). Pączki is the plural form of the Polish word pączek [ˈpɔnt​͡ʂɛk], though many English speakers use paczki as singular and paczkis as plural. In English, the common pronunciation /ˈpɔːntʃki/ imitates the Polish pronunciation, but some speakers pronounce the word /ˈpʊntʃki/ or /ˈpʌntʃki/. The Polish word "pączek" itself is a diminutive of pąk ("plant bud").

A pączek is a deep-fried piece of dough shaped into a flattened sphere and filled with confiture or other sweet filling. Pączki are usually covered with powdered sugar, icing or bits of dried orange zest. A small amount of grain alcohol (traditionally, Spiritus) is added to the dough before cooking; as it evaporates, it prevents the absorption of oil deep into the dough.

Although they look like berliners (German name), bismarcks (south-central Canada/north-central US name), and jelly doughnuts (generic name; sometimes "jam donut"), pączki are made from especially rich dough containing eggs, fats, sugar and sometimes milk. They feature a variety of fruit and creme fillings and can be glazed, or covered with granulated or powdered sugar. Powidła (stewed plum jam) and wild rose hip jam are traditional fillings, but many others are used as well, including strawberry, Bavarian cream, blueberry, custard, raspberry and apple.