Carl Heinrich (1880 New York City – 1955) was an American entomologist.
He studied Greek and drama at the University of Chicago, he moved to Washington D.C., in 1902, where he worked in business. In 1908, he went to New York to study music. Heinrich moved back to Washington and in 1913 joined the United States Department of Agriculture. He initially worked on applied entomology but later switched to specialise in the study of Lepidoptera.
He was editor of the Proceedings of the Entomological Society of Washington from 1924 to 1926. 
Carl Ferdinand Cori, ForMemRS was a Czech-American biochemist and pharmacologist born in Prague who, together with his wife Gerty Cori and Argentine physiologist Bernardo Houssay, received a Nobel Prize in 1947 for their discovery of how glycogen – a derivative of glucose – is broken down and resynthesized in the body, for use as a store and source of energy. In 2004, both Coris were designated a National Historic Chemical Landmark in recognition of their work that elucidated carbohydrate metabolism.
Philipp Christoph Zeller was a German entomologist.
Hermann August Hagen was a German entomologist who specialised in Neuroptera and Odonata. He had established himself as one of Europe's preeminent entomologists by 1867 when he accepted a position at Harvard University to curate the Museum of Comparative Zoology. In 1870 he became the first entomologist in the United States to hold the formal title, Professor of Entomology.
Augustus Radcliffe Grote was a British entomologist who described over 1,000 species of butterflies and moths. He is best known for his work on North American Noctuidae. A number of species were named after him, including the moth Horama grotei.
Carl Robert Osten-Sacken or Carl-Robert Romanovich, Baron von der Osten-Sacken, Baron Osten Sacken was a Russian diplomat and entomologist. He served as the Russian consul general in New York City during the American Civil War, living in the United States from 1856 to 1877. He worked on the taxonomy of flies in general and particularly of the family Tipulidae.
Rosa Smith Eigenmann was an American ichthyologist, as well as a writer, editor, former curator at the California Academy of Sciences, and the first librarian of the San Diego Society of Natural History. She "is considered the first woman ichthyologist in the United States." Eigenmann was also the first woman to become president of Indiana University's chapter of Sigma Xi, an honorary science society. She authored twelve published papers of her own between 1880 and 1893, and collaborated with her husband, Carl H. Eigenmann, as "Eigenmann & Eigenmann" on twenty-five additional works between 1888 and 1893. Together, they are credited with describing about 150 species of fishes.
Caryl Parker Haskins (1908–2001) was an American scientist, author, inventor, philanthropist, governmental adviser and pioneering entomologist in the study of ant biology. Along with Franklin S. Cooper, he founded the Haskins Laboratories, a private, non-profit research laboratory, in 1935. He was professor at Union College. He also served on boards of nonprofits such as the Carnegie Institution of Washington and the Smithsonian Institution.
Gene Ezia Robinson is an American entomologist, Director of the Carl R. Woese Institute for Genomic Biology and National Academy of Sciences member. He pioneered the application of genomics to the study of social behavior and led the effort to sequence the honey bee genome. On February 10, 2009, his research was famously featured in an episode of The Colbert Report whose eponymous host referred to the honey Dr. Robinson sent him as "pharmaceutical-grade hive jive".
Harrison Gray Dyar Jr. was an American entomologist after whom a pattern of geometric progression in the growth of insect parts is named - Dyar's Law. He was also noted for eccentric pursuits which included digging tunnels under his home. He had a complicated personal life and along with his second wife he adopted the Baháʼi faith.
William Schaus was an American entomologist who became known for his major contribution to the knowledge and description of new species of the Neotropical Lepidoptera.
Cahela is a monotypic snout moth genus described by Carl Heinrich in 1939. Its only species, Cahela ponderosella, the cahela moth, described by William Barnes and James Halliday McDunnough in 1918, is found in Mexico and in the US states of California, Texas, Arizona, Utah and probably Nevada.
Honora perdubiella is a species of snout moth in the genus Honora. It was described by Harrison Gray Dyar Jr. in 1905. It is found in North America, including Utah, and British Columbia.
John Merton Aldrich was an American entomologist. Aldrich was the Associate Curator of Insects at the United States National Museum. He is considered one of the most prolific entomologists in the study of flies.
George Marx was a German-born American arachnologist, scientific illustrator and physician. He was regarded as one of the foremost authorities on spiders and highly regarded for his superb scientific illustrations.
Eugene Gordon Munroe was a Canadian entomologist who discovered numerous species of insects. He worked for the Insect Systematics and Biological Control Unit, Entomology Division in Ottawa, Canada.
Johannes Heinrich Justus Carl Ernst Brauns, more known as Hans Brauns, was a German physician and entomologist.
Carl Frederick William Muesebeck was an American entomologist who specialized in the Hymenoptera. He worked at the insect identification division of the US Department of Agriculture and was also a research associate at the Smithsonian Institution.
Thomas Borgmeier was a German-Brazilian priest and entomologist and became a specialist on the ants of Brazil and on the flies in the family Phoridae. He was also the founder of the journals Revista de Entomologia edited it from 1931 to 1951 and the Studia Entomologica from 1958.
Theodore Pergande was a German-born American entomological pioneer known for his skills in rearing insects. He made careful observations on aphids and thrips and made collections and studies on North American ants, several of which, including the harvester ant Messor pergandei and the scale insect Parlatoria pergandii, have been named after him.
Charles Frederic August Schaeffer was an American entomologist who specialized in beetles, particularly chrysomelids and weevils. He described 109 species in 91 genera and some species like Taphrocerus schaefferiNicolay & Weiss were described from his collections and named after him.