Blenheim may refer to a number of towns and cities in different countries:

• Blenheim, a city in New Zealand.
• Blenheim, New York is a town in Schoharie County, New York.
• Blenheim Palace, an English stately home.
• Blenheim: a village in Bavaria, Germany (origin of usage).

Blenheim may also refer to a number of wars:

• The Battle of Blenheim was fought in 1704 during the War of the Spanish Succession.
• The Bristol Blenheim was a World War II-era light bomber of the Royal Air Force.