Summerville-Princeton-Southern Bay is a local service district and designated place in the Canadian province of Newfoundland and Labrador.

Summerville-Princeton-Southern Bay is in Newfoundland within Subdivision F of Division No.

[2] It consists of the communities of Summerville, Princeton and Southern Bay.

[1] Summerville-Princeton-Southern Bay is a local service district (LSD)[3] that is governed by a committee responsible for the provision of certain services to the community.

[4] The chair of the LSD committee is Tony Harris.