Jordanus is the Latin form of Jordan and may refer to:
Jordanus of Bristol, a saint venerated in Bristol, England Jordan Catala (Friar Jordanus), a 14th-century French missionary and explorer Jordanus de Nemore (Renaissance version: Jordanus Nemorarius), a medieval mathematician Jordanus of Saxony, c. 1190–1237, 2nd Master General of the Order of Preachers (Dominicans) Raymundus Jordanus, a 14th-century Christian writer also known as Idiota
It may also refer to: Jordanus (constellation), an obsolete constellation name 25 Canum Venaticorum, a star named Jordanus after the constellation