Lower Philipstown () is a barony in County Offaly (formerly King's County), Ireland.
The name Lower Philipstown is derived from Philipstown, the former name of Daingean.
Lower Philipstown is located in northeast County Offaly and contains Croghan Hill and part of the Bog of Allen.
Lower Philipstown was roughly formed from the ancient tuaths; Tuath Rátha Droma and Tuath Cruacháin of the UàFailge (O'Connor Faly). àhAonghusa (O'Hennessy) alongside àhUallacháin (O'Houlihan) are cited here as chiefs of Clan Colgan, near Croghan Hill. The original Philipstown barony was split into upper and lower by 1807.
Below is a list of settlements in Lower Philipstown: