688
| Years: 684 685 686 687 - 688 - 689 690 691 692 | |
| Decades: 650s 660s 670s - 680s - 690s 700s 710s | |
| Centuries: 6th century - 7th century - 8th century | |
Events
- Emperor Justinian II of the Byzantine Empire defeats the Bulgarians.
- King Caedwalla of Wessex abdicates the throne and goes on a pilgrimage to Rome.
- Charles Martel, Mayor of the Palace of the Kingdom of the Franks (approximate date)
- Perctarit, king of the Lombards
688 is also the hull number of the US Navy attack submarine USS Los Angeles. The number has come to be a shorthand reference for all of the many submarines of the Los Angeles class. For instance, 688 Sub Attack is a computer game about submarines.