Slate Hill Burying Ground (also known as Old Slate Hill Burying Ground and Yardley Cemetery) is a historic cemetery in Lower Makefield Township, Pennsylvania, with most of its graves dating to 18th century Quaker settlers. It is located at Yardley-Morrisville Road and Mahlon Drive. The Quaker section has 185 marked graves out of a total of 487, most pre-dating 1800. The public section has 96 marked graves including those of six free African Americans who served in the Union Army during the American Civil War. The cemetery was added to the National Register of Historic Places in 1982.