John Stevens Henslow (1796-1861) was an English botanist and clergyman known for his contributions to the field of natural history. He served as a professor of botany at the University of Cambridge and was influential in the study of plant taxonomy. Henslow is best remembered for mentoring Charles Darwin during his time at Cambridge, encouraging his interest in natural sciences. Henslow played a significant role in the early development of the British Association for the Advancement of Science and was involved in various scientific societies. He also contributed to the establishment of the Cambridge University Botanic Garden, promoting the study of plants and their classification.