Louis Théodore Frederic Colladon (25 August 1792 in Geneva – 25 April 1862) was a Swiss physician and botanist known for his investigations of the plant genus Cassia. He was the son of pharmacist and amateur botanist Jean-Antoine Colladon (1755–1830). He studied medicine at the University of Montpellier, where one of his instructors was botanist Augustin Pyramus de Candolle. After graduation, he started a medical practice in Paris. As a physician, he distinguished himself in the treatment of cholera patients during the epidemic of 1832. Among his written works was a monograph on Cassia titled "Histoire naturelle et médicale des casses, et particulièrement de la casse et des sénés employés en médecine" (1816) and a tale involving descent in a diving bell that was published in English as "Narrative of a descent in the diving-bell, &c. &c." (Edinburgh : Printed for A. Constable, 1821). In 1830 the plant genus Colladonia was named in his honor by Augustin Pyramus de Candolle.
The standard author abbreviation Collad. is used to indicate this person as the author when citing a botanical name. (en)
