Ronneby is a locality and the seat of Ronneby Municipality in Blekinge County, Sweden with 12,029 inhabitants in 2010.

Ronneby is regarded as the heart of "the Garden of Sweden", and in 2005 the park "Brunnsparken" in Ronneby was voted Sweden's most beautiful park. 2006 the park was voted Europe's 4th most beautiful park. The church Heliga Kors kyrka was founded in the 12th century, modified and extended until the 15th century, and badly damaged during Northern Seven Years' War in the 16th century.