The Hundred of Strathalbyn is a cadastral division of the County of Hindmarsh in South Australia. It lies west of the Adelaide Hills and east of Lake Alexandrina and includes at its southwestern extremity the town of Strathalbyn. Its name is derived from that used for a sub-division granted in 1841. No definitive derivation for the subdivision of Strathalbyn name is known but it is deemed probable that John Rankine or his brother William provided the name with the meaning given as "white valley" from the Scottish srath and albion. Mount Barker Creek forms much of the northern hundred boundary while the Bremer River forms the eastern border.