Karl Elsener

Karl or Carl Elsener may refer to:
 * Karl Elsener (footballer) (1934–2010), Swiss football goalkeeper
 * Karl Elsener (inventor) (1860–1918), inventor of the Swiss Army knife
 * Carl Elsener (1886–1950), entrepreneur, son of the inventor
 * Carl Elsener Sr. (1922–2013), entrepreneur, nephew of the inventor
 * Carl Elsener Jr. (born 1958), entrepreneur, grand-nephew of the inventor