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

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

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

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

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

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