The Kashubians, also known as Cassubians or Kashubs, are a Lechitic ethnic group native to the historical region of Pomerania, including its eastern part called Pomerelia, in north-central Poland. Their settlement area is referred to as Kashubia. They speak the Kashubian language, which is classified as a separate language closely related to Polish.

Kashubian or Cassubian is a West Slavic language belonging to the Lechitic subgroup along with Polish and Silesian. Although often classified as a language in its own right, it is sometimes viewed as a dialect of Polish.