Robert S. Murphy (October 18, 1861 – June 24, 1912) was an American lawyer and politician who served as the ninth lieutenant governor of Pennsylvania from 1907 to 1911.

[1] Murphy attended Hedding College and the Pennington School and in 1880 moved to Johnstown, Pennsylvania.

Murphy successfully ran as a Republican for Cambria County District Attorney in 1892, despite the overwhelming Democratic majority in terms of party registration.

His political career culminated in his election as lieutenant governor in 1906 as running mate of Edwin Sydney Stuart.

[1] Murphy died suddenly of apoplexy at his home in Overbrook, Pittsburgh, at the age of 51.