Bas Treub (The Hague, 1987) is a Dutch violinist. Since 2014, he has held the position of Principal Second Violin with the Netherlands Chamber Orchestra and has performed with a variety of music groups internationally.

Bas has served as guest concertmaster with the Philharmonia Orchestra, the Arnhem Philharmonic Orchestra, the PHION orchestra, the Orpheus Sinfonia, the LUDWIG collective, and the Dutch Ballet Orchestra. In his capacity as Principal 2nd violin, he has performed with the Scottish Chamber Orchestra, the Scottish Ensemble, the Royal Northern Sinfonia, the Netherlands Philharmonic Orchestra, and the Royal Concertgebouw Orchestra as a guest musician.

Bas has performed with ensembles such as the Mahler Chamber Orchestra, the Lucerne Festival Orchestra, the Deutsche Kammerphilharmonie Bremen, the London Sinfonietta, the Asko/Schönberg Ensemble, the Amsterdam Sinfonietta, and Spira Mirabilis as a freelance violinist. Bas was a member of the European Union Youth Orchestra for many years and served as its concertmaster during his final years.

A passionate chamber and orchestral musician, Bas has performed at international festivals and venues such as the BBC Proms, Aldeburgh Festival, Edinburgh Festival, Ojai Festival, Abu Dhabi Festival, Carnegie Hall, Konzerthaus Berlin, Wigmore Hall and Concertgebouw Amsterdam. He has performed chamber music with many well-known artists, including Gary Hoffman, Alasdair Beatson, Matthew Truscott, Gérard Caussé and the Edinburgh Quartet and the Navarra Quartet. As an orchestral leader, he collaborated closely with well-known musicians such as Vladimir Ashkenazy, Isabelle Faust, and Gautier Capuçon. Bas enjoys performing music from all periods and in a variety of settings.

He studied with Peter Brunt and Philippe Graffin at the Royal Conservatoires of The Hague and Brussels, where he received his Master of Music degree summa cum laude. He plays a beautiful violin made in Paris in 1891 by Emile Germain, which was generously loaned to him by the Dutch Musical Instruments Foundation.