The Shire of Merredin is a local government area in the Wheatbelt region of Western Australia, about east of Perth, the state capital. Its seat of government is the town of Merredin, where 2,804 of the Shire's 3,595 residents live. The Shire covers an area of .
On 30 June 1921, the Merredin Road District was created. On 1 July 1961, it became a shire under the Local Government Act 1960.
On 3 May 2003, all wards were abolished and all 11 councillors sit at large.
Prior to this, the ward structure was as follows:
The towns and localities of the Shire of Merredin with population and size figures based on the most recent Australian census:
, 99 places are heritage-listed in the Shire of Merredin, of which 15 are on the State Register of Heritage Places.