Roslyn is an unincorporated community in Abington Township, Montgomery County, Pennsylvania, United States. Originally called Hillside, the name Roslyn came from rose gardens that once grew there. The first known person of European descent to settle the area was John Tyson, who bought a tract of land here in 1717. He built lime kilns to turn the abundant local limestone into quicklime, starting an industry that operated into the late 20th century. The headwaters for Sandy Run, a tributary of the Wissahickon Creek, are located in Roslyn.