Aldan is a borough in Delaware County, Pennsylvania, United States.

The Aldan Police Department is appointed by the borough council.

According to the U.S. Census Bureau, the borough has a total area of 0.6 square miles (1.6 km2), all land.

The main thoroughfares include Providence Road and Clifton Avenue, which intersect near the center of town.

29.5% of all households were made up of individuals and 12.8% had someone living alone who was 65 years of age or older.

William Penn School District serves Aldan.