Macdonald, Meredith and Aberdeen Additional is a township in Algoma District, Ontario, Canada. Originally surveyed as separate geographical townships, Macdonald and Meredith were incorporated as a single, municipal township in 1892. The geographical township of Aberdeen Additional was added to Macdonald and Meredith township in 1899 to create the municipal township of Macdonald, Meredith and Aberdeen Additional.
The township encompasses the unincorporated communities of Echo Bay, Bar River and Sylvan Valley.
Bar River is a small hamlet straddling the boundary between the townships of Macdonald, Meredith and Aberdeen Additional and Laird.
Echo Bay is located on the shores of the eponymous Echo Bay and Lake George. The community is home to a big loonie, similar to the Big Nickel in Sudbury, around 260 kilometres (160 mi) eastward. Robert-Ralph Carmichael, one of the Canadian dollar coin's designers, lives near Echo Bay.