Bayham (2011 Population: 6,989) is a municipality in the southeast corner of Elgin County, Ontario, Canada.

It is south of the town of Tillsonburg and Oxford County.

Bayham was named in 1810 for Viscount Bayham Charles Pratt, a friend of land grant recipient Colonel Talbot.

In 1998, Bayham was re-amalgamated with Port Burwell and Vienna and Eden to form an expanded Municipality of Bayham.

The municipality comprises the communities of Corinth, Eden, Froggetts Corners, North Hall, Port Burwell, Richmond, Springer's Hill, Straffordville, Vienna and Wadger.