Robert Denniston[1] (October 15, 1800, in Blooming Grove, Orange County, New York – December 2, 1867, in Salisbury Mills,[2] Orange County, New York) was an American lawyer and politician.
He served as an officer of the New York State Militia and as a Justice of the Peace in Blooming Grove.
He was appointed by Governor William L. Marcy to be a judge of the Court of Common Pleas of Orange County.
He was a Democratic member of the New York State Assembly (Orange Co.) in 1835, 1839 and 1840.
As a Republican, he ran for New York State Comptroller in 1857 but was defeated by Democrat Sanford E. Church.