Janssen
# Janssen

Janssen may refer to:

## Astronomy

* Janssen (lunar crater)
* Janssen (Martian crater)
* Janssen (planet), an exoplanet also known as 55 Cancri e

## Other

* Janssen (surname) is a common Dutch surname, cognate of "Johnson"
* Janssen Biotech, American biotechnology company
* Janssen COVID-19 vaccine, a COVID-19 vaccine
* Janssen Pharmaceuticals, a Belgian company
* USS Janssen (DE-396), World War II US Navy destroyer escort
* E. Janssen Building, a historic building in Eureka, California
