Clark's Harbour is a town on Cape Sable Island in southwestern Nova Scotia, Canada, located in Shelburne County.

The strong influence of the Atlantic ocean also produces significant seasonal lag, with September having the warmest year-round lows, as well as having warmer weather in the daytime compared to July.

The economy of Clark's Harbour and its surrounding areas is driven largely by the fishing industry and in particular the seasonal lobster fishery.

There are several other employers in Clark's Harbour, including a general store, a service station, a pizza parlor, and a takeout restaurant.

It joined the Western Counties Regional Library in July 1971 but it did not have a physical location in Clark's Harbour until the first branch opened on March 4, 1974 .

[10] One of the more notable attractions in Clark's Harbour is the United Baptist Stone Church, which is a popular destination for visitors.