Rock Lake was a provincial electoral division in the Canadian province of Manitoba.
Most of the area was merged into the constituency of Pembina.
It was located in the southern part of the province.
It was bordered to the north by Souris-Lansdowne, to the east by Pembina, to the west by Turtle Mountain, and to the south by the American state of North Dakota.
Source: Elections Manitoba[1] 1958: 1959: 1962: 1966: 1969: 1973: 1977: