West Friesland or Westfriesland can refer to the following:

  • West Friesland (region), a contemporary region in the province of North Holland, Netherlands
  • The same region as the State of West Friesland in the Dutch Republic
  • Occasionally, the region where the West Frisian language is spoken, i.e., mostly the province of Friesland in the Netherlands <!-- The use in English of West Friesland (rather than West Frisia) for the province of Friesland is rare, if it happens at all. -->
  • West Frisia, the western part of the historical region of Frisia
  • Westfriesland, a Dutch ship of the line of 78/80 guns of the Admiralty of the Noorderkwartier, built in c. 1666
  • Westfriesland, a Dutch ship of the line of 90 guns of the Admiralty of the Noorderkwartier, built in 1682