The Cockeysville Marble is a Precambrian, Cambrian, or Ordovician marble formation in Baltimore, Carroll, Harford and Howard Counties, Maryland.

[1] The extent of this formation was originally mapped in 1892[2] within Baltimore County.

A historical account is given in Maryland Geological Survey Volume Two.

[3] The Cockeysville was also mined for crushed stone at what is now called Quarry Lake.

The Cockeysville was mined by Lafarge and by Martin Marietta Inc. at the Marriottsville Quarry, Marrtiottsville, Maryland.