Flatten may refer to:

• Amy Flatten, American expert on international scientific collaboration and abstract oil painter
• Flat-ten engine, an engine with two banks of five opposing cylinders each
• Svein Flåtten, Norwegian politician
• Mount Flatten, mountain in the animated television series The Rocky and Bullwinkle Show
• Flattening, the compression of a circle or sphere into an ellipse or an ellipsoid
• Flattening of affect, loss or lack of emotional expressiveness
• Flattening the curve, a technique to slow spread of a pathogen in order to minimize peak demand on healthcare resources
• Regrading, changing the slope or grade of land; levelling
• Flat-file database, a database file format where there are no structures for indexing or recognizing relationships between records; flattened

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• Flat (disambiguation)

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