John H. Mulkey (May 24, 1824 – July 9, 1905) was an American attorney and judge from Kentucky. Mulkey worked a series of jobs until William J. Allen loaned him his law books in 1851 so that he could study. Two years later, Mulkey was admitted to the bar and practiced in Southern Illinois. He served a short term on an Illinois circuit court and then was elected to the Supreme Court of Illinois in 1879 for a nine-year term.