Recommended translations:

• Plato. Plato’s Symposium: A Translation by Seth Benardete with Commentaries by Allan Bloom and Seth Benardete. Translated by Seth Benardete. Chicago: University of Chicago Press, 2000.
• Plato. "Symposium." Translated by A. Nehamas and P. Woodruff. In Plato: Complete Works, edited by J. M. Cooper, 457–505. Indianapolis: Hackett Publishing, 1997.

An excerpt- Socrates’ recounting of Diotima’s teachings on the “Ladder of Love”:

“He who has been instructed thus far in the things of love, and has learned to see the beautiful in due order and succession, when he comes toward the end will suddenly perceive a nature of wondrous beauty… a beauty which is everlasting, not growing and decaying, or waxing and waning;… but beauty absolute, separate, simple, and everlasting…”

 

 

Online:
The University of Chicago Press (Trans. Benardete)
Amazon (Trans. Benardete)
Hackett Publishing (Trans. Nehamas and Woodruff)
Amazon (Trans. Nehamas and Woodruff)
Project Perseus (English, Free Access)
Project Perseus (Greek, Free Access)
Project Gutenberg (Free Access)