Karel Johan Gustav Hartlaub (8 November 1814 – 29 November 1900) was a German physician and ornithologist.
Hartlaub was born in Bremen, and studied at Bonn and Berlin before graduating in medicine at Göttingen. In 1840, he began to study and collect exotic birds, which he donated to the Bremen Natural History Museum. He described some of these species for the first time. In 1852, he set up a new journal with Jean Cabanis, the Journal für Ornithologie. He wrote with Otto Finsch, Beitrag zur Fauna Centralpolynesiens: Ornithologie der Viti-, Samoa und Tonga- Inseln. Halle, H. Schmidt. This 1867 work which has handcoloured lithographs was based on bird specimens collected by Eduard Heinrich Graeffe for Museum Godeffroy. A number of birds were named for him, including Hartlaub's bustard, Hartlaub's duck, and Hartlaub's gull.
- Beolens, Bo; and Michael Watkins (2003). Whose bird? : common bird names and the people they commemorate. London: Christopher Helm. ISBN 0-300-10359-X.
- Media related to Gustav Hartlaub at Wikimedia Commons
- Works by or about Gustav Hartlaub at Internet Archive
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