ashlar

thumb|Dry stone|Dry ashlar masonry laid in parallel courses on an Inca wall at [[Machu Picchu]] thumb|Ashlar masonry north gable of Banbury Town Hall, Oxfordshire thumb|quarry-faced stone|Quarry-faced red Longmeadow sandstone in random ashlar was specified by architect [[Henry Hobson Richardson for the North Congregational Church (Springfield, Massachusetts, 1871).]]

Ashlar () is cut and dressed stone worked to achieve a specific form, typically rectangular; a structure built from such stones; and the look created by the dressing technique. Ashlar stone may be dry laid or bedded in mortar.