CYF can refer to:
Cyfraith Hywel (Welsh: [ˈkəvraiθ ˈhəwɛl]; Laws of Hywel), also known as Welsh law (Latin: Leges Walliæ ), was the system of law practised in medieval Wales before its final conquest by England.
Cytoplasmic FMR1-interacting protein 2 is a protein that in humans is encoded by the CYFIP2 gene. Cytoplasmic FMR1 interacting protein is a 1253 amino acid long protein and is highly conserved sharing 99% sequence identity to the mouse protein.
The Cyfarthfa Ironworks was a major 18th century and 19th century ironworks located in Cyfarthfa, on the north-western edge of Merthyr Tydfil, in South Wales.
Cyfe, Inc. is a self-service cloud based business intelligence application software company based in Los Angeles, California.
Cyfuture (formerly Cyber Futuristics) is an Indian IT, ITES and SEO services company that provides data center, cloud, Search engine ranking, Internet Marketing, Online promotion and business process outsourcing services.
Cyfarthfa Castle (Welsh: Castell Cyfarthfa) is a castellated mansion that was the home of the Crawshay family, ironmasters of Cyfarthfa Ironworks in Park, Merthyr Tydfil, Wales.
Cyfluthrin is a pyrethroid insecticide and common household pesticide. It is a complex organic compound and the commercial product is sold as a mixture of isomers.
Cytoplasmic FMR1-interacting protein 1 is a protein that in humans is encoded by the CYFIP1 gene.
Cyfarthfa High School is a comprehensive school, based in Merthyr Tydfil County Borough, Wales, that was established in 1970. Cyfarthfa means "Place of the barking (dog)" in Welsh and the school crest reflects this.