Cotan

Cotan may refer to:


 * Cotangent, abbreviated as cotan, a trigonometric function

People with the surname

 * Alin Coțan (born 1982), Romanian footballer
 * Antonio Cotán (born 1995), Spanish footballer
 * Imron Cotan (born 1954), Indonesian diplomat
 * Juan Sánchez Cotán (1560–1627), Spanish painter of still lives