FSE

• Federation of European Scouting (disambiguation) (French: {{lang|fr|Fédération du Scoutisme Européen}})
• Ferrovie del Sud Est, an Italian railway company
• Football Supporters Europe, a football fan network
• Fung Seng Enterprises, a Hong Kong conglomerate
• Franciscan Sisters of the Eucharist, a Roman Catholic religious congregation

• Fast Software Encryption, cryptography conference
• Finite-state entropy, entropy coding scheme

• Frankfurt Stock Exchange, Germany's largest stock exchange
• Fukuoka Stock Exchange, a stock exchange in Japan

• Feline spongiform encephalopathy
• Fetal scalp electrode

• Fast Spin Echo, a type of magnetic resonance imaging sequence
• Free surface effect, liquids in slack tanks

• Finnish Sign Language (fse), the ISO languagecode for the Finnish sign language
• Fremont Street Experience, a pedestrian mall
• Field service engineer

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