Series Twelve of Midsomer Murders premiered 19 March 2009, and concluded on 4 October 2009.
|Overall Episode Number Within the Series||Series Number||Order Number||Title||Broadcast Date||Screenplay or Episode Writer||Director||Notes|
|67||12||1||The Dogleg Murders||19 March 2009||Andrew Payne||Richard Holthouse|
|68||12||2||The Black Book||26 March 2009||Nicholas Martin||Peter Smith|
|69||12||3||Secrets and Spies||7 July 2009||Michael Aitkens||Renny Rye|
|70||12||4||The Glitch||21 July 2009||Michael Russell||Richard Holthouse|
|71||12||5||Small Mercies||20 September 2009||Peter J. Hammond||Peter Smith|
|72||12||6||The Creeper||27 September 2009||Andrew Payne||Renny Rye|
|73||12||7||The Great and the Good||4 October 2009||David Hoskins||Richard Holthouse||This was the last episode of series twelve.|
Community content is available under CC-BY-SA unless otherwise noted.