Henry Keep (June 22, 1818 – July 30, 1869) was an American currency speculator, banker, stock speculator, and railroad financier who invested heavily in the Chicago and North Western Railway, Cleveland and Toledo Railroad, Michigan Southern and Northern Indiana Railroad, and New York Central Railroad. He was treasurer of the Michigan Southern and Northern Indiana Railroad from 1861 to 1863, and briefly president of the New York Central Railroad in 1866.