The 2004 Isle of Anglesey County Council election took place on Thursday 10 June 2004 to elect members of the Isle of Anglesey County Council in Wales. This was the same day as other United Kingdom local elections. The next full council election was on 1 May 2008.
Prior to the election the county council had been governed for 15 months by a coalition led by Plaid Cymru's Bob Parry. After the 2004 election Plaid Cymru became the official opposition with 8 councillors. There were 28 councillors not affiliated to any political party, comprising ten declared Independents and eighteen who gave no description.
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Events prior to 2008 election
The Plaid Cymru councillor for the Llanfihangel Ysgeifiog ward, Hughie Noel Thomas, resigned from the party group in October 2006. He was jailed for nine months on 6 November 2006 (and disqualified from being a county councillor) for falsifying Post Office records. He had been sub-postmaster in the village of Gaerwen. Independent councillor Eric Jones was elected at a by-election in 2007.
- "Anglesey election: Plaid to seek Labour council deal". BBC News. 3 May 2013. Retrieved 23 March 2019.
- "Labour hail a return to the fold - Who controls the councils?". North Wales Live. 15 June 2004. Retrieved 23 March 2019.
- "Isle of Anglesey County Council Election Results 1995-2008" (PDF). The Elections Centre. Retrieved 23 March 2019.
- "Postmaster jailed for £48k false accounting". North Wales Live. 7 November 2006. Retrieved 23 March 2019.