No, it isn't. Captain Corelli's Mandolin is a fictional story created by the author.
Captain Corelli's Mandolin is not based on a true story. It's a work of imagination and creativity by the writer. However, it might draw inspiration from various real-life elements or themes.
The story of Captain Corelli's Mandolin is purely fictional. It doesn't have a basis in real events. But often, fictional works can touch on universal emotions and experiences that feel real to the readers.