John Joseph Coughlin (August 15, 1860 – November 11, 1938), known as "Bathhouse John" or "the Bath", was an American politician who served as alderman of Chicago's 1st ward from 1892 until his death. Representing the Chicago Loop and in later years its environs, he represented what was often called the "world's richest ward". Alongside his partner, fellow 1st ward alderman Michael "Hinky Dink" Kenna, he controlled the ward for most of the first half of the 20th century.