Hermann Howaldt (26 November 1852, Kiel - 17 May 1900, Kiel) was a German engineer and entrepreneur; co-founder and board member of "Howaldtswerke AG", now Howaldtswerke-Deutsche Werft (HDW).
After attending the, he served an apprenticeship as a mechanical engineer at "Schweffel & Howaldt", with his father, August Howaldt. He then completed a formal study of the subject at the Technical University of Hanover.
In 1880, following August's retirement, he and his brothers, and, took over the company and changed its name to "Gebrüder Howaldt". he worked as the chief designer and, later, Operations Manager. When the company was incorporated as "Howaldtswerke AG" in 1889, he became a board member and Director of the machine factory. Just before his death, he was elected a member of the Kreistag (District Council) for the . It is generally believed that he died from overwork.
He was married twice, to Emma Amalia Christiane, née Jungclaussen (1859-1885), and her sister, Maria Elisabeth Magdalena (1852-1930). He had five children, altogether. His son, Erwin, married Anneliese Scheibe, daughter of the mineralogist, .
In 2005, HDW became a division of "ThyssenKrupp Marine Systems".
In Kiel, at the mouth of the Schwentine, the site of the original shipyard is now occupied by the, an old factory building that was reimagined as a museum, by the architect, .