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.

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.

Parts of the Bugle Ranges, Mount Barker, Mount Barker Springs, Petwood and Wistow localities also overlap the northwestern part of the hundred.

The Corporated Town of Strathalbyn seceded in 1868 to form dedicated local government for the township until it re-amalgamated with the district council in 1976.