Mesembria, modern Nesebar, is an ancient Greek city in Thrace, on the Black Sea coast of Bulgaria.

Mesembria or Messembria or Mesambria may also refer to:

• Mesembria (Zone), the ancient Greek polis of Zone, on the Aegean coast of Western Thrace, Greece, whose archaeological remains were formerly identified as "Mesembria"
• Mesambria (Aegean Sea), another ancient Greek settlement on the Aegean coast of Western Thrace (exact location unknown)
• Mesimvria, Evros, a modern Greek village near Mesembria–Zone.

This disambiguation page lists articles about distinct geographical locations with the same name.
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