Calamus

Calamus may refer to:

Botany and zoology

 * Calamus (fish), a genus of fish in the family Sparidae
 * Calamus (palm), a genus of rattan palms
 * Calamus, the hollow shaft of a feather, also known as the quill
 * Acorus calamus, the sweet flag, a tall wetland plant, commonly referred to as calamus in herbal medicine

Place names

 * Calamus, Iowa, United States
 * Calamus, Wisconsin, United States
 * Calamus Creek (disambiguation)
 * Calamus Swamp, Ohio, United States

Other uses

 * Calamus (DTP), a desktop publishing application
 * Calamus (poems), a series of poems by American writer Walt Whitman
 * Calamus Ensemble, a classical music ensemble featuring Roberto Carnevale
 * Ensemble Cálamus, a classical music ensemble featuring Eduardo Paniagua
 * USS Calamus (AOG-5) a Mettawee-class gasoline tanker acquired by the U.S. Navy
 * Calamus or Kalamos, a figure in Greek mythology
 * Calamus, a character from the 2014 puzzle/adventure game OneShot