Rockcreek is a census-designated place in Washington County, Oregon, United States, north of U.S. Route 26.

Named for Rock Creek, a tributary of the Tualatin River, that flows north to south through the neighborhood.

The community is bordered on the south and west by Hillsboro, with Cornelius Pass Road dividing the two on the west and the Sunset Highway as the dividing line on the south.

According to the United States Census Bureau, the CDP has a total area of 2.0 square miles (5.2 km2), all land.

There were 3,609 housing units at an average density of 1,799.8 per square mile (694.9/km2).

20.3% of all households were made up of individuals, and 3.4% had someone living alone who was 65 years of age or older.