Margaretta Hare Morris (December 3, 1797 – May 29, 1867) was a pioneering American entomologist known for her groundbreaking work with agricultural pests, including the Hessian fly, cicadas, and the Colorado potato beetle. Born into a prominent family in Philadelphia, Morris received a comprehensive education, which fueled her passion for entomology. Despite societal expectations for women of her status to marry, Morris remained unmarried, devoting her life to scientific pursuits alongside her sister Elizabeth. The sisters turned part of their home into a laboratory and library to support their scientific studies. Morris's primary research focus was the study of the Cecidomyia culmicola, a species of gal midge resembling the Hessian fly. Her observations and discoveries challenged existing scientific knowledge, contributing significantly to the field of entomology. Additionally, she and astronomer Maria Mitchell were the first women elected to the American Association for the Advancement of Science in 1850. Margaretta Hare Morris's legacy continues to inspire and impact the scientific community, despite the historical obstacles she faced due to her gender.

Margaretta Palmer (1862–1924) was an American astronomer, renowned for being one of the first women to earn a doctorate in astronomy. Born in Branford, Connecticut, Palmer graduated from Vassar College in 1887 before joining the Yale University Observatory. Her groundbreaking 1894 doctorate from Yale focused on the calculation of the orbit of a comet discovered by Maria Mitchell in 1847, a subject demonstrating her expertise and dedication to the field. Throughout her career, Palmer made significant contributions to astronomy, including determining the orbits of comets and collecting observations of Jupiter's moons. She was a member of the American Astronomical Society and authored religious publications on Episcopalianism. Palmer's legacy continues to inspire future generations of astronomers. Tragically, she passed away in 1924 following injuries sustained in an automobile accident, leaving behind a remarkable scientific and academic legacy.

Margaretta M. Lovell is an esteemed American art historian, currently holding the prestigious Jay D. McEvoy, Jr. Professor of the History of Art position at the University of California, Berkeley. With a strong focus on the art and history of the United States, her research and teaching encompass a wide array of subjects including landscape painting, portraiture, decorative arts, furniture, architecture, food, and forests from the eighteenth and nineteenth centuries. Lovell boasts an impressive academic background, having earned a B.A. in English from Smith College, an M.A. from the University of Delaware's joint program in Early American Culture with the Winterthur Museum, and a Ph.D. in American Studies from Yale University. Her illustrious career has seen her hold faculty appointments at several renowned institutions, including Yale, Harvard University, the University of Michigan, College of William & Mary, and Stanford University. Lovell's outstanding contributions have been recognized with numerous accolades and honors, including the Charles C. Eldredge Prize for Distinguished Scholarship in American Art and the Ralph Henry Gabriel Prize of the American Studies Association. Additionally, she has authored several influential books, such as "Art in a Season of Revolution" and "A Visitable Past," which have solidified her reputation as a leading authority in the field.

Margaretta Amelia Foster, 1st Viscountess Ferrard (née Burgh; c. 1737 – 20 January 1824), was a notable Anglo-Irish peeress known for her association with John Foster, 1st Baron Oriel, the last Speaker of the Irish House of Commons. Born as the daughter of Thomas Burgh and Anne Downes, she entered into matrimony with the esteemed politician John Foster on 14 December 1764. In recognition of her status and contributions, she was honored with the title Baroness Oriel in 1790 and then further elevated to Viscountess Ferrard in 1797. Viscountess Ferrard was a mother to three children and was succeeded in her titles by her eldest surviving son, Thomas. Her legacy is closely tied to the influential House of Burgh, an Anglo-Norman and Hiberno-Norman dynasty. Margaretta Amelia Foster's enduring impact is evident through her familial lineage and the enduring recognition of her husband's achievements, symbolized by the creation of the barony of Oriel in 1821.

Margaretta Mitchell, born May 27, 1935, is an accomplished American photographer and writer based in Berkeley, California. With a legacy spanning decades, Mitchell's work is renowned for her captivating portraits and still lifes, as well as her contributions to art criticism, biographies of women artists, and photographic histories. Graduating magna cum laude from Smith College in 1957, Mitchell's early career saw her serving as a research assistant to Edwin Land, a pivotal figure in the development of the Polaroid instant camera. Mitchell's photographic style aligns with the Pictorialist tradition, emphasizing line and shadow, particularly in black and white compositions, with occasional forays into incorporating graphic media, notably in her images of flowers. Her work is prominently housed in esteemed collections such as the Amon Carter Museum of American Art, the International Center of Photography, the Akron Art Museum, and the San Francisco Museum of Modern Art. Notably, Mitchell spearheaded the influential exhibition and book "Recollections: Ten Women of Photography," shedding light on the underappreciated contributions of women to the field. Mitchell's literary contributions include several significant publications, including biographies and photographic compilations. Personally, Mitchell has been married twice and raised three daughters. In 2018, she remarried to Sim Warkov.