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