Plants

• Acorus calamus, sweet flag, a plant in the Acoraceae family
• Any of the plants in the family Cyperaceae
  Cyperaceae
  Cyperaceae are a family of monocotyledonous graminoid flowering plants known as sedges, which superficially resemble grasses or rushes. The family is large, with some 5,500 species described in about 109 genera. These species are widely distributed, with the centers of diversity for the group...
  
  

Animals

• A collective noun for several species of birds, including bitterns, cranes and herons
• Sedge-fly, caddisfly

Other uses

• Sedge, nickname of Liversedge F. C., a football (soccer) club in West Yorkshire, England, a coastguard cutter: see List of United States Coast Guard cutters