Oberburg (English: Upper Castle) or Oberstadt (Upper Town) is the upper section of the medieval municipality of Regensberg, Switzerland, which was founded as a hilltop fortified settlement.

[1] The 13th-century Regensberg Castle is located in Oberburg, which is enclosed by the town wall, partly formed by two rows of houses which were constructed in the late 17th century.

Regensberg Reformed Church overlooks the main square.

Beside it is the round tower (German: rundturm), the only remnant of the castle.

Oberburg is separated from Unterburg (lower castle), likely built in the 14th century, by a gate.