Ludwig Carl Friedrich (Louis) Graeser (12 February 1840, Dresden – 9 December 1913, Hamburg) was a German entomologist who specialised in Palearctic Lepidoptera.
He was a bookbinder.
His collections are in the Zoological Museum of the Zoological Institute of the Russian Academy of Sciences (Amur, Siberia) and Zoologisches Museum Hamburg (West Palearctic)