Eton and Castle is an electoral ward of the Royal Borough of Windsor and Maidenhead. It was first used at the 2003 elections. The ward returns councillors to Windsor and Maidenhead Borough Council. It covers Eton, Berkshire and Windsor Castle. The ward was formed in 2003 from all of Eton North and South and parts of the Castle, Eton West and Old Windsor wards. It was subject to a boundary revision in 2019 which increased the number of councillors from one to three.
There was a revision of ward boundaries in Windsor and Maidenhead in 2019. The ward gained territory from Castle Without and Eton Wick and lost territory to Old Windsor.
The ward was created in 2003 from all of Eton North and South and parts of the Castle, Eton West and Old Windsor wards.
The election took place on 7 May 2015.
The by-election took place on 11 August 2011.
The election took place on 5 May 2011.
The election took place on 3 May 2007.
The election took place on 1 May 2003.