Recommended translation: The Guide of the Perplexed. Translated with an introduction and notes by Shlomo Pines.With an introductory essay by Leo Strauss. Chicago: University of Chicago Press, 1963.   Originally composed in Arabic, in 1190.

The Guide presents the Law and philosophy as espousing two different, even contradictory views of the world. The perplexity induced by these two different worldviews is Maimonides’ main subject in the Guide.

Online:
The Chicago University Press
Arabic edition: Dalālat al-Ḥāʾirīn. ed. S. Munk-I. Joel. Jerusalem, 1929 [pdf]
Hebrew translation (Qafih translation)
Hebrew translation by Michael Schwarz (Tel Aviv University Press, 2002)
Earlier English translation , now in the public domain: M. Friedländer (Routledge: 1910)