Vilamovian or Wilamowicean (Wymysiöeryś) is a West Germanic language spoken in the small town of Wilamowice (Wymysoj in Vilamovian) near Bielsko-Biała, on the border between Silesia and Lesser Poland in the historical region of Galicia. At present, there are about 70 native users of Vilamovian, the majority of them elderly people; Vilamovian is therefore a moribund language.

In origin, Vilamovian appears to derive from 12th century Middle High German, with a strong influence from Low German, Dutch, Frisian, Polish and Old English. The inhabitants of Wilamowice are thought to be descendants of German, Dutch and Scottish settlers who arrived in Poland in the 13th century. However, the inhabitants of Wilamowice always denied any connections with Germany and proclaimed their Dutch origins.^{[citation needed]}

Vilamovian was the vernacular language of Wilamowice until 1939–1945. After World War II, local communist authorities forbade the use of the language. Although the ban was lifted after 1956, Vilamovian has been gradually replaced by Polish, especially amongst the younger generations.