Maryborough East or East Maryborough () is a barony in County Laois (formerly called Queen's County or County Leix), Ireland.
Maryborough is the former name of the town of Portlaoise, established in 1548 and named after Queen Mary I; it was given its current name in 1929.
Maryborough East is located in central County Laois.
Maryborough East and West were in the Middle Ages the land of the Cinel Crimthann, an Irish clan with the surname ÃÂ Duibh (Duffy or O'Diff).
It is referred to in the topographical poem Tuilleadh feasa ar ÃÂirinn óigh (Giolla na Naomh àhUidhrÃÂn, d. 1420):
Maryborough was originally a single barony; it was divided into East and West before 1807.
Below is a list of settlements in Maryborough East barony: