Clive Anthony Stace (born 1938) is a British botanist and botanical author.
His academic career was based at the University of Leicester, where he held the post of Professor of Plant taxonomy.
He is a past president of the Botanical Society of Britain and Ireland.
In 2012 a newly described grass species, Brachypodium stacei (previously regarded as a form of purple false brome), was named in his honour.He has also been responsible for a number of notable publications relating to the vascular plant flora of Britain and Ireland:
Hybridization and the flora of the British Isles
New Flora of the British Isles
Vice-county Census Catalogue of the Vascular Plants of Great Britain
Alien PlantsHe also wrote the student textbook Plant Taxonomy and Biosystematics.