Crowmarsh was a rural district in Oxfordshire, England from 1894 to 1932.

It was created under the Local Government Act 1894 from the part of the Wallingford rural sanitary district in Oxfordshire.

Crowmarsh Rural District continued to be administered from Wallingford, with meetings held in the workhouse in the town.

Since 1974 the entire area has been part of the district of South Oxfordshire, which also includes Wallingford and district.

[2] The district consisted of the following civil parishes: †To Bullingdon RD in 1932 ‡To Henley RD in 1932