The Little Clyde River is a river in the municipality of Lanark Highlands, Lanark County in Eastern Ontario, Canada.

[1] It is in the Saint Lawrence River drainage basin, is a right tributary of the Clyde River, and was named after the River Clyde in Scotland.

The Little Clyde River begins at the outflow from Tate Lake in geographic Dalhousie Township.

[2] It flows east, then turns northeast, passes the community of Poland, enters geographic Lanark Township,[3] and reaches its mouth at the Clyde River.

The Clyde River flows via the Mississippi River and the Ottawa River to the Saint Lawrence River.