Marilyn "Marian" Hope Pettibone (1908–2003) was a curator at the Smithsonian's National Museum of Natural History invertebrate zoology department.

[citation needed] Pettibone began in 1930 as a research and laboratory assistant at the University of Oregon until 1933.

She then became a biology instructor at St. Helen's Hall Junior College in Portland, Oregon, from 1935 to 1942, and at the University of Washington, Seattle in 1945 to 1949.

Then in 1953 she became an Associate Professor of zoology at the University of New Hampshire until she moved back to Washington, D.C., in 1963 to work at the Smithsonian's National Museum of Natural History as the Curator of Polychaetes.

While at the University of New Hampshire Pettibone wrote part 1 of her work called "Marine Polychaete Worms of the New England Region", which was published in 1963.