Gordon Pennington Gunter (August 18, 1909 – December 19, 1998) was an American marine biologist and fisheries scientist. He is noted for his pioneering study of fisheries in the northern Gulf of Mexico, a topic to which he devoted his entire professional life over a career spanning 60 years. His own research, and that of the scientists under his direction, established an understanding of the ecology, comparative physiology of the plant and animal life, and commercial fisheries of the region, and he coined the phrase "fertile fisheries crescent" to refer to Mississippi Sound and adjacent waters along the United States Gulf Coast. He also pioneered the study of the comparative physiology of shellfish and fish.

Gordon Pennington Gunter was born in Goldonna, Louisiana, on August 18, 1909. Arriving at Louisiana State Normal College in Natchitoches, Louisiana, with plans to study to become a lawyer or a French scholar, he instead took a strong interest in biology as soon as he took his first college course in the subject, and he graduated in 1929 with a Bachelor of Arts in Zoology. He then attended the University of Texas in Austin, Texas, to study bacteriology and received a master's degree in 1931.

After graduation, Gunter became a researcher for the United States Bureau of Fisheries, studying shrimp and oysters in Louisiana and Florida. He also studied ichthyology at the Scripps Institution of Oceanography in La Jolla, California, and participated in the U.S. Engineers Office′s Debris Dam Fisheries Survey.

In 1939, Gunter returned to the University of Texas as an instructor in physiology, concurrently taking a position as a marine biologist with the Texas Fish, Game and Oyster Commission. He received a Ph.D. in physiology and zoology from the University of Texas in 1945.

The University of Texas founded the Institute of Marine Science at Port Aransas, Texas, in 1945, and Gunter began research there after receiving his Ph.D. He served as acting director of the institute from 1949 to 1954 and as its director from 1954 to 1955. He also was the editor of the University of Texas's Publications of the Institute of Marine Science from 1950 to 1955 and founded the publication Contributions to Marine Science.

In 1955, Gunter left Texas to become director of the University of Southern Mississippi′s Gulf Coast Research Laboratory in Ocean Springs, Mississippi, a position he assumed on September 1, 1955. At the time, the laboratory was merely a part-time summer school teaching facility with one full-time scientist (a marine biologist) and two part-time support personnel making up its entire paid staff and a physical plant that was so limited that students often worked and studied outdoors. Gunter had a vision of the laboratory becoming a major research center for the study of marine biology and fisheries in the Gulf of Mexico; he set about fulfilling that vision, and he is best known for his tenure at the laboratory. During its 16 years with Gunter as its director, the laboratory experienced tremendous growth in the size of its scientific staff, its educational efforts, and its physical plant. The laboratory's first project under Gunter's direction funded by the United States Fish and Wildlife Service was a study of the life cycle of the menhaden published in 1958, and much of the significant early fisheries research in the northern Gulf of Mexico took place under his direct supervision as director.

Gunter was an avid and voracious reader and believed strongly in keeping up to date on current professional literature, and on September 1, 1955, as one of his first initiatives as director, he established a research library at the laboratory for use by faculty, staff, visiting scientists, and students. The library began as a collection of books and reprints in Gunter's office, and he built its collection almost singlehandedly, purchasing and donating to it many of the early volumes in its collection. In April 1961 he established the publication Gulf Research Reports – renamed Gulf and Caribbean Research in 2002 – which he described as "...devoted primarily to publication of the data of the Marine Sciences, chiefly of the Gulf of Mexico and adjacent waters." He also used Gulf Research Reports as a means of further building the laboratory's library, trading issues of the publication for scientific journals to add to the library's collection, and the library became arguably the premier marine library on the U.S. Gulf Coast. In 1963, a full-time professional staff began working at the library, by 1971 it took up a third of the ground floor of one of the laboratory's buildings, and by May 2010 its collection exceeded 27,000 volumes.

After he arrived in 1955, Gunter oversaw a construction program to give the laboratory far more extensive and modern facilities. His tenure saw the construction of the laboratory's oceanography building, a 40-room brick dormitory, the anadromous fisheries building (destroyed by Hurricane Katrina in 2005), the research building, the Caylor Building, and a maintenance shop, as well as the rebuilding of the Hopkins teaching laboratory (destroyed by Hurricane Camille in 1969). The 65-foot (20-meter) research vessel Gulf Researcher also was constructed for the laboratory while he was the director. Gunter also pursued other goals to build a significant research program at the laboratory, including the recruitment of high-quality personnel, developing a network of affiliated colleges and universities to enhance the summer field program by bringing in students from other universities and other states, the founding of a museum, and championing the laboratory and its work to state university presidents and the members of the Board of Trustees of the Institutes of Higher Learning of the State of Mississippi, the Mississippi Legislature, and the Mississippi Academy of Sciences.