Niehaus
- Bernd H. Niehaus Quesada, a Doctor Summa Cum Laude in International Law from the University of Strasbourg
- Carl Niehaus (born 1959), the spokesman for South African ruling party the African National Congress
- Charles Henry Niehaus (1855, Cincinnati, Ohio - 1935), an American sculptor
- David Arnold Niehaus (1935 - 2010), an American sportscaster
- Richard J. Niehaus (1892 - 1957), a Major League Baseball pitcher
- Ed Niehaus, an American CEO and publicist
- Francis "Fanny" W. Niehaus (1902, Seymour, Indiana - ?), a professional football player
- Jeffrey J. Niehaus, professor of Old Testament at Gordon-Conwell Theological Seminary
- Judith ("Jutta") Niehaus (born 1964, Bocholt, North Rhine-Westphalia), a West German racing cyclist
- Lennie Niehaus (born 1929), an American alto saxophonist, arranger, and composer
- Steve Niehaus, a defensive lineman in the NFL
- Tom Niehaus, a Republican member of the Ohio Senate
- Brett Niehaus, Senior Class Commencement Speaker, University of Scranton 2012
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