Albert Lock is a canal lock situated on the Jamestown Canal in County Roscommon, Ireland, built in 1848 by the Shannon Commissioners as part of a widescale upgrade of the Shannon Navigation.

It bypasses an unnavigable, rocky stretch of the River Shannon between the villages of Drumsna and Jamestown. The lock measures approximately 102 feet by 30 feet (roughly 31 metres by 9 metres).

The structure features robust retaining walls of coursed cut limestone, with the name "Albert Lock" carved prominently on the north side, along with tooled stone mooring posts and cast-iron mooring rings.

Both the lock and the adjacent lock keeper's cottage are listed as protected structures on the Record of Protected Structures and are noted by the National Inventory of Architectural Heritage for their architectural, social, and technical significance.