YW may refer to:
14-3-3 protein zeta/delta (14-3-3ζ) is a protein that in humans is encoded by the YWHAZ gene on chromosome 8. The protein encoded by this gene is a member of the 14-3-3 protein family and a central hub protein for many signal transduction pathways.
Sir Yvain , also known as Ywain, Owain, Uwain(e), Ewaine, etc., is a knight of the Round Table in Arthurian legend, wherein he is often the son of King Urien of Gorre and the sorceress Morgan le Fay.
YWAM Liberty is the former L'Astrolabe, a French icebreaking research vessel which was used to supply the Dumont d'Urville research station in Antarctica.
YWAM Koha is a New Zealand-registered Medical Aid Ship, built in 1968 as the buoy tender Konrad Meisel for the German Government and later owned in South Africa as Isibane.
Yws Gwynedd is a Welsh rock band from North Wales named after its lead singer Ywain Gwynedd.
14-3-3 protein epsilon is a protein that in humans is encoded by the YWHAE gene.
14-3-3 protein theta is a protein that in humans is encoded by the YWHAQ gene.