Dinefwr (also written Dynefwr and anglicised as Dynevor) may refer to:
Places District of Dinefwr, a local government district of Dyfed, Wales, from 1974 to 1996 Carmarthen East and Dinefwr (UK Parliament constituency), created in 1997 Carmarthen East and Dinefwr (Assembly constituency), created in 1999 Dinefwr Castle, a Welsh castle near Llandeilo, Carmarthenshire Dinefwr Park National Nature Reserve Plas Dinefwr, a country house now called Newton House, Llandeilo
People Baron Dynevor House of Dinefwr, a royal house of Wales