Osier may refer to:
- Willow or osier, a genus of deciduous trees and shrubs
- Common osier (Salix viminalis), a species of willow
- Red osier (Cornus sericea), a species of flowering plant
- Osier, Colorado, an unincorporated community along the Rio de Los Pinos river in Colorado
- Osier, Michigan, a ghost town
- Faith Osier, African immunologist
- Ivan Osier (1888–1965), Danish Olympic medalist
See also
- Osiier, a surname
- Cornus, a genus of woody plants