Cape Breton East (formerly Sydney River-Mira-Louisbourg) is a provincial electoral district in Nova Scotia, Canada, that elects one member of the Nova Scotia House of Assembly.

It gained the area on the north side of East Bay along highway 216 to include Eskasoni First Nation.

In 2013, following the recommendations of the 2012 Electoral Boundaries Commission, the district was renamed Sydney River-Mira-Louisbourg.

It gained the Mira Road, Sydney River, Prime Brook, and Coxheath areas from Cape Breton South, as well as a section of Grand Lake Road from Cape Breton Nova.

[4] The riding was renamed Cape Breton East for the 2021 Nova Scotia general election.