The Cobe Estate, also known as Cariad or Oak Hall, is a historic summer mansion house on Bluff Road in Northport, Maine.

It was built in 1912-14 for Chicago lawyer Ira M. Cobe, and was listed on the National Register of Historic Places in 1983.

Its long facades face the northeast and southwest, and are sheltered by two-story colonnades of columns, round on one side and square on the other.

The southwest colonnade is topped by a Colonial Revival railing, protecting a balcony space accessible from the attic level.

Cobe's wife Anne was from Belfast, Maine, and the house was built in Northport so that she could be nearer her family in the summertime.