朗德罗克（Round Rock）也称为圆石城，是美国德克萨斯州的一座城市。位于德克萨斯州威廉森县和特拉维斯县，临近德克萨斯州的首府奥斯汀。朗德罗克有德克萨斯州体育之都之称。朗德罗克的教育事业颇为发达。朗德罗克也是跨国企业戴尔公司的总部。

Round Rock is a city in the U.S. state of Texas, located in Williamson County, which is a part of the Greater Austin, Texas metropolitan area. The 2014 census estimate places the population at 112,744.

The city straddles both sides of the Balcones Escarpment, a fault line in which the areas roughly east of IH-35 are flat and characterized by having black, fertile soils of the Blackland Prairie, and the west side of the Escarpment which consists mostly of hilly, karst-like terrain with little topsoil and higher elevations and which is part of the Texas Hill Country. Located about 20 miles (32 km) north of downtown Austin, Round Rock shares a common border with Austin at Texas State Highway 45.