Ismo is a given name. Notable people and characters with the name include:
- Ismo Alanko, Finnish musician
- Ismo Falck, Finnish archer
- Ismo Hölttö, Finnish photographer
- Ismo Junni (1943–1995), Finnish serial killer and arsonist
- Ismo Kamesaki, Finnish wrestler
- Ismo Kanerva, Finnish rower
- Ismo Laitela, fictional character in the Finnish soap opera Salatut elämät
- Ismo Lehkonen, Finnish ice hockey player
- Ismo Leikola, Finnish comedian
- Ismo Lius, Finnish footballer
- Ismo Lindell, Finnish electrical engineer and academician
- Ismo Sajakorpi, Finnish director and screenwriter
- Ismo Toukonen, Finnish steeplechase runner
- Ismo Villa (1954–2014), Finnish ice hockey player
- Ismo Vorstermans, Dutch footballer
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