Theodora Emily Colborn (née Decker; March 28, 1927 – December 14, 2014) was an American zoologist. She was the founder and President Emeritus of The Endocrine Disruption Exchange (TEDX). Colborn was also professor Emeritus of Zoology at the University of Florida, Gainesville. She was best known for her studies on the health effects of endocrine disrupting chemicals.