Thou is an archaic second person singular pronoun in English. Thou may also refer to: Thousandth(s) of an inch, a derived unit of length used in engineering and manufacturing Thousand Thou., a reference to French botanist Louis-Marie Aubert du Petit-Thouars Geography Le Thou, a commune of Charente-Maritime, France Thou, Cher, a commune of Cher, France Thou, Loiret, a commune of Loiret, France Music Thou (Belgian band), a Belgian rock band Thou (American band), an American sludge metal band People with the family name de Thou Jacques Auguste de Thou, French historian Christophe de Thou, French advocate Nicolas de Thou, French cleric, Bishop of Chartres See also Thon (disambiguation)