Robert Duff (July 21, 1868 – October 11, 1928) was a merchant and politician in Newfoundland.

[1] Born in Carbonear on July 21, 1868, Duff became a prominent business owner in the area.

[2] Duff was president of William Duff & Sons Ltd., the Public Service Electric Co., the Harbour Grace Marine Railway Dock Co. and the Conception Bay Mutual Marine Co.

[1] Duff was elected to the Newfoundland assembly in 1924 as a Liberal-Progressive.

In 1926, he transferred his support to the government of Walter Stanley Monroe and was made a minister without portfolio in the cabinet.