Lists of monarchs in the British Isles are lists of monarchs that have reigned over the various kingdoms and other states that have existed in the British Isles throughout recorded history. They include monarchs of Britain as a whole, and monarchs of states that covered part or whole of what are now England, Ireland, Scotland, Wales and the Isle of Man.
Britain
England
- Angles
- Bernicia
- Deira
- East Anglia
- Elmet
- Essex
- Hwicce
- Isle of Wight
- Kent
- Lindsey
- Magonsæte
- Mercia
- Northumbria
- Rheged
- Sussex
- Wessex
- York
Ireland
- Ailech
- Airgíalla
- Breifne
- Connacht
- Dublin
- Leinster
- Mide
- Magh Luirg
- Munster
- Osraige
- Tara
- Tír Eoghain
- Uisnech
- Ulster
Scotland
- Aeron
- Dál Riata
- Eidyn
- Galloway
- Gododdin
- Isles / Isles (lords) / Islay
- Orkney
- Picts
- Rhinns
- Strathclyde
Wales
- Brycheiniog
- Ceredigidion
- Deheubarth
- Dyfed
- Ergyng
- Glywysing
- Gwent
- Gwynedd
- Morgannwg
- Powys
- Rhwng Gwy a Hafren
- Seisyllwg