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Theodore Edward (Theodor Edvard) Cantor (1809–1860) was a Danish physician, zoologist and botanist.
Cantor worked for the British East India Company. He made natural history collections in Penang and Malacca.
In the scientific field of herpetology he described many new species of reptiles and amphibians. Pelochelys cantorii, commonly known as Cantor's giant softshell turtle, is named in his honor.
He was the author of
- Notes respecting some Indian fishes (1839)
- General features of Chusan (1842)
- Catalogue of Malayan Reptiles (1847)
- Catalogue of Malayan fishes (1850)