Johnston Cornish ( born June 13, 1858 in Bethlehem, Hunterdon County, New Jersey, † June 26, 1920 in Washington, New Jersey ) was an American politician. Between 1893 and 1895 he represented the State of New Jersey in the U.S. House of Representatives.
Johnston Cornish attended the public schools of his home. In 1870 he moved with his parents to Washington in Warren County. Later he graduated from the Easton Business College in Pennsylvania. He then worked as a piano and organ builder. At the same time he began a political career as a member of the Democratic Party. In the years 1884, 1885 and 1886, he was elected mayor of Washington. From 1891 to 1893 he sat in the New Jersey Senate.
In the congressional elections of 1892 Cornish was in the fourth electoral district of New Jersey in the U.S. House of Representatives in Washington DC chosen, where he became the successor of Samuel Fowler on March 4, 1893. Since he has not been confirmed in 1894, he was able to complete only one term in Congress until March 3, 1895. Between 1900 and 1902, and again from 1906 to 1911 he was again in the New Jersey Senate.
In 1910 Cornish president of his company Cornish Piano Co. was He was also a member of the State Board of the Democratic Party. He also served as president of the First National Bank in his hometown of Washington and the Washington Water Co. and the Warren County Bankers' Association. He died on 26 June 1920 in Washington, where he was also buried.