Janssen
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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 Pharmaceuticals, a Belgian company
- Janssen Biotech, an American subsidiary
- Janssen COVID-19 vaccine
- Script error: No such module "WPSHIPS utilities"., World War II US Navy destroyer escort
- E. Janssen Building, a historic building in Eureka, California