The Mercer's Mill Covered Bridge or Mercer's Ford Covered Bridge is a covered bridge that spans the East branch of the Octoraro Creek on the border between Lancaster County and Chester County in Pennsylvania, United States.

[2] The bridge has a single span, wooden, double Burr arch trusses design with the addition of steel hanger rods.

[2] It is painted red, the traditional color of Lancaster County covered bridges, on both the inside and outside.

Added in 1980, it is listed on the National Register of Historic Places as structure number 80003509.

[4] The bridge is located in Sadsbury Township, 0.5 miles (0.8 km) south of Christiana on Bailey Crossroads Road off Creek Road, to the south of Pennsylvania Route 372.