UDH may refer to:
Technology User Data Header, a binary structure at the start of some short messages in cell phones Universal derailleur hanger , a standard for attaching rear derailleurs on bicycles
Medicine and biology Uronate dehydrogenase, an enzyme Usual ductal hyperplasia, a benign lesion of the breast wherein cells look very similar to normal
Organizations and places Udhailiyah (Aramco code: UDH), place in Saudi Arabia hosting a small oil company United for Human Rights (Spanish Unidos por los Derechos Humanos), a political party in Venezuela University Dental Hospital in Wales Utah Department of Health, the Government of Utah's body responsible for public health