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Eef van Breen (born January 3, 1978) is a Dutch jazz trumpeter, singer, arranger and composer.
Eef van Breen was born in Westerbork, a town in the Dutch province of Drenthe.
In 2010, Eef van Breem was commissioned to write the music for the Klingon Opera ’u’, the first opera in the Klingon language.
His debut album Playing Games (2010, Challenge Jazz) obtained an Edison nomination. 
- "Playing games", Challenge Records, 2010
- "Changing Scenes", Challenge Records, 2011