Robert Barclay Dennis (July 21, 1819 – March 24, 1884) was an American politician from Ohio.
Robert Barclay Dennis was born on July 21, 1819, on a farm in Pomfret, Connecticut.
He graduated the Friend's School (later the Moses Brown Academy) in Providence, Rhode Island.
He served as speaker pro tempore and as chairman of the judiciary committee.
[1] Dennis married his cousin Harriet Frances Congdon of Hampton, Connecticut.