University of Oxford (UK)
Beazley Archive: Dionysos
Illustrated dictionary entry for Greek god Dionysos. Describes his lineage, symbols associated with him, and his involvement with the other Greek Gods.
Bartleby
Bartleby.com: Bulfinch's Mythology: Bacchus
The history of the god Bacchus, the god of wine, includes the perilous circumstances of his birth and the foundation of his devotions, the Bacchanal.
Other
Dionysos
Lengthy discussion of Dionysos that cites a variety of sources. Includes a bibliography, as well as quotations from Euripidies and others.