Wilhelm Janssen
Wilhelm Janssen or Wilhelm Janßen is the name of the following people:
- Wilhelm Janßen (1933–2017), German architect, university professor and building historian
- Wilhelm Janssen (historian) (* 1933), German historian
- Wilhelm Leopold Janssen (politician, 1830) (1830–1900), German administrative officer, District Administrator in the Heinsberg district
- Wilhelm Leopold Janssen (diplomat) (1859–1915), German cloth manufacturer and diplomat
- Wilhelm Leopold Janssen (politician, 1891) (1891–1945), German administrative officer, Landrat Landkreis Aachen
See also:
- Willem Janssen
- Willy Janssen (* 1960), Dutch soccer player