Osier may refer to:
Willow or osier, a genus of deciduous trees and shrubs Common osier (Salix viminalis), a species of willow Osier bed, where willows were traditionally planted, coppiced, and harvested on the banks of waterways 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 in the Upper Peninsula of Michigan Faith Osier, African immunologist Ivan Osier (1888–1965), Danish Olympic medalist
See also Osiier, a surname Cornus, a genus of woody plants