The Herald Formation is a stratigraphical unit of Late Ordovician age in the Western Canadian Sedimentary Basin.

It was defined in well Imperial Herald 1-31-1-20W2M by the Lower Paleozoic Names and Correlations Committee of the Saskatchewan Geological Society in 1958.

The Herald Formation reaches a maximum thickness of 38 metres (120 ft) in the Lake Alma area.

[1] It can be correlated with the Fort Garry Member of the Red River Formation in Manitoba and in the Williston Basin.

In south-eastern Saskatchewan, the formation is divided in three units, corresponding to three sedimentation cycles: