John B. Longley (June 23, 1830 – April 30, 1892) was an American lawyer and politician from New York.
He worked as a clerk in a dry goods store there for two years, after which he attended the Hudson Academy.
[1] He studied law in the office of future New York Supreme Court Justice Henry Hogeboom.
In 1884, Longley unsuccessfully ran for the New York State Assembly in the Kings County 10th District as a Democrat, losing to the Republican incumbent James Taylor.
[6] Longley briefly lived West as a young man, and while in La Crosse, Wisconsin he met Emma F. Tompkins.
On April 30, 1892, while on his way to a meeting of the Twenty-second Ward Democratic Association, he felt faint and a policeman took him home.