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:''For the sub-Roman and medieval kingdom, see Kingdom of Dyfed''.
'Dyfed' is a late 20th century county of Wales.
The Local Government Act 1972 caused the county of Dyfed to be created on April 1, 1974. It covered the former administrative counties of Cardiganshire, Carmarthenshire, Pembrokeshire which were divided into local government districts as so :

Admin county	Districts in 1974
Cardiganshire	Ceredigion
Carmarthenshire	Carmarthen, Dinefwr, Llanelli
Pembrokeshire	Preseli, South Pembroke

The Lord Lieutenant of Dyfed had previously been the Lord Lieutenant of Pembrokeshire, with the Lord Lieutenant of Cardiganshire and Lord Lieutenant of Carmarthenshire becoming Lieutenants. The Dyfed-Powys Police had been created a number of years earlier.
The Local Government (Wales) Act 1994 broke up Dyfed into three unitary authorities on April 1, 1996 : Cardiganshire (which renamed itself Ceredigion as soon as it was able), Carmarthenshire and Pembrokeshire, but retained Dyfed as a preserved county for a few purposes (such as Lieutenancy).