Iris Sheila Collenette (née Darnton) (born 26 August 1927, died 24 July 2017) was a British botanist, plant collector, and author noted for her work on the flora of Saudi Arabia, particularly her books An illustrated guide to the flowers of Saudi Arabia and Wildflowers of Saudi Arabia.
The species Aloe sheilae and Rhytidocaulon sheilae were named in her honor.
She identified at least fourteen species.
The standard author abbreviation Collen.
is used to indicate this person as the author when citing a botanical name.