Jansen

Jansen may refer to:

People

 * Jansen (surname), a Dutch surname, cognate of Johnson

Places

 * Jansen, Saskatchewan, Canada
 * Jansen, Colorado, United States
 * Jansen, Nebraska, United States

Other uses

 * Jansen AG, Swiss steel and plastic company, founded by Josef Jansen of Aachen
 * Jansen (crater), lunar crater named after Dutch inventor of the telescope Sacharias Jansen
 * Jansen's metaphyseal chondrodysplasia, rare disease discovered by the orthopedic surgeon Murk Jansen
 * Jansenism, Catholic theological movement named after the Dutch theologian Cornelius Jansen