Llanfihangel Ysgeifiog (occasionally spelt Llanfihangel Esgeifiog or Llanfihangelesgeifiog) is a community (civil parish) and former former ecclesiastical parish in Anglesey, Wales, east of Llangefni.
Coal was mined in the area from the 15th to the 18th centuries.
Until 2012 the community's boundaries, together with those of neighbouring Penmynydd, defined the electoral ward of Llanfihangel Ysgeifiog. This ward elected a county councillor to the Isle of Anglesey County Council until The Isle of Anglesey (Electoral Arrangements) Order 2012 redrew the boundaries for the 2013 elections.
In November 2006 the Plaid Cymru councillor for the Llanfihangel Ysgeifiog ward, Hughie Noel Thomas, was jailed for nine months (and disqualified as a county councillor) for falsifying Post Office records. He had been sub-postmaster in Gaerwen. Independent councillor Eric Jones was elected at a by-election in 2007.
- http://data.ordnancesurvey.co.uk/; tilt: Llanfihangel Ysgeifiog. Retrieved 15 July 2014.
- A Vision of Britain Through Time. Retrieved 15 July 2014.
- "St Michael's Church". Royal Commission on Ancient and Historical Monuments in Wales. 7 August 2007. Retrieved 24 March 2019.
- "Cynghorwyr/Councillors". Llanfihangel Esgeifiog Community Council. Retrieved 24 March 2019.
- "Postmaster jailed for £48k false accounting". North Wales Live. 7 November 2006. Retrieved 24 March 2019.
- "Isle of Anglesey (Electoral Arrangements) Order 2012" (PDF). legisaltion.gov.uk. The National Archives. Retrieved 24 March 2019.
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