Considerations on the Causes of the Greatness of the Romans and Their Decline  
   Two separate translations of Montesquieu's 1734 work of historical commentary.
   http://www.constitution.org/cm/ccgrd.htm

Montesquieu: The Spirit of Laws  
   The complete Nugent translation, available in HTML or plain-text formats.
   http://www.constitution.org/cm/sol.htm

Oxford University Comparative Law Forum: Montesquieu in England  
   Essay by Iain Stewart on Montesquieu's thought in relation to England, including a full translation of his Notes on England.
   http://ouclf.iuscomp.org/articles/montesquieu.shtml

Persian Letters  
   Text of the eleventh and twelfth letters, both from Usbek to Mirza.
   http://www.class.uidaho.edu/mickelsen/texts/Montesquieu%20-%20Letters.htm

Quotations by Montesquieu on Political Philosophy  
   Assembled quotes, without citations.
   http://www.geocities.com/wulffrith_47/Quotes_mont.html

Modern History Sourcebook: Spirit of the Laws  
   Excerpt from the first volume of Montesquieu's monumental 1748 opus.
   http://www.fordham.edu/halsall/mod/montesquieu-spirit.html

De L'Esprit des Lois  
   Online French and English editions of the text. The English version is only available in PDF format.
   http://www.ecn.bris.ac.uk/het/montesquieu/index.htm