St. Mark's Cross is a high cross and National Monument located in Blessington, County Wicklow, Ireland.

[2][3] St. Mark's Cross is presently located at the south wall of Burgage cemetery, Blessington, 600 m (660 yd) west of the River Liffey.

[4] St. Mark's Cross was erected in the 12th century next to a church and holy well in Burgage More.

The original site was submerged during the creation of Poulaphouca Reservoir, and the cross was moved to Burgage cemetery.

[5] The cross is made of blue-grey granite and stands 4.3 metres (14 ft) high.