Nissen

Nissen may refer to:


 * Nissen (surname)
 * Saint Nissen, a 5th century Irish abbot
 * a creature in Norse mythology, see Tomte
 * a Nissen hut, a building shaped like a tube cut in half along the middle and made from corrugated iron sheets
 * the Nissen Building in Winston-Salem, North Carolina
 * Nissen fundoplication, a surgical procedure to treat gastroesophageal reflux disease and hiatal hernia