Ilex is the genus of flowering plants also known as holly. Ilex or ILEX may also refer to: Biology Centrolene ilex, a South American frog Quercus ilex (the holm or holly oak), a Mediterranean tree Enterprises and organizations ILEX Press Ltd., division of Hachette publishing books on graphics Ilex Theatre Company at Hollyfield School, Surrey, England Ilex Urban Regeneration Company Ltd., an urban regeneration company set up by the Northern Ireland Executive International Legal Exchange Program (or ILEX), a student exchange program for law students Institute of Legal Executives (or ILEX), a professional (and examination) body in England & Wales Intelligent Labelling Explorer (or ILEX), an artificial intelligence project at the University of Edinburgh, Scotland Other uses HMS Ilex (D61), a British Royal Navy I-class destroyer that served during World War II