Roja Municipality (, ) was a former municipality in Courland, Latvia. The municipality was formed in 2009 by merging MÃÂrsrags parish and Roja parish the administrative centre being Roja. Since 2010 a separate MÃÂrsrags municipality has been created. The population in 2020 was 3,368.
On 1 July 2021, Roja Municipality ceased to exist and its territory was merged into Talsi Municipality.