David Barclay (1823 – September 10, 1889) was a Democratic member of the U.S. House of Representatives from Pennsylvania.
He studied law in Pittsburgh, was admitted to the bar and practiced in Punxsutawney, Brookville, and Kittanning, Pennsylvania.
[3][4] He became one of the editors and publishers of the Pittsburgh Union and Legal Journal, and worked in that capacity from 1850 to 1855.
[5][6] While a resident of Brookville, Barclay was elected as a Democrat to the Thirty-fourth Congress.
[7][8] At the end of his legislative career, he resumed the practice of law.