Willebrand or Willebrands may refer to:
- Von Willebrand disease, a hereditary coagulation abnormality disease
- Von Willebrand factor, a blood glycoprotein involved in hemostasis
- Erik Adolf von Willebrand, a Finnish internist
- Julia Willebrand, an environmental, peace and education activist
- Johannes Willebrands, a Dutch Cardinal of the Roman Catholic Church