Ithan (pronounced EYE-thun), formerly known as Radnorville, is a small village and neighborhood located in Villanova, Pennsylvania, west of Philadelphia.

It is generally considered to include all portions of Villanova approximately a half mile either side of the Blue Route.

It encompasses the Ardrossan estate and the small community of Banjo Town[3] to the west, and the Agnes Irwin School to the east.

The community is located in the center of Radnor Township, southeast of Wayne, and is nearly entirely residential, barring a small business district on the north side of the Meetinghouse.

All of Ithan is part of the Radnor Township School District, and the community is also home to the Academy of Notre Dame de Namur.