Janet Johnson may refer to:
- Janet Johnson (Egyptologist) (born 1944), American Egyptologist and academic
- Janet Johnson (politician) (1940–1999), American politician in Minnesota
- Janet Julian (born 1959), American actress also credited under her birth name Janet Louise Johnson
- Janet Ramsay Johnson (1914–1983), Australian born actress
- Janet Mae Johnson (1936–1973), mountaineer and educator
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