Mariana Rosas is an Argentinian conductor based in the UK and Chorus Director of the London Symphony Chorus. In that role she has collaborated with Sir Antonio Pappano, Giannandrea Noseda, Michael Tilson Thomas, Yannick Nézet-Séguin, Nathalie Stutzmann, Susanna Mälkki, Teodor Currentzis, Gustavo Dudamel, and Dr André J. Thomas.

She has worked with the Royal Opera House, Glyndebourne, Royal College of Music, Birmingham Opera Company, London Youth Choirs, Rundfunkchor Berlin, BBC Symphony Chorus, City of Birmingham Symphony Orchestra Chorus, SWR Symphony Orchestra (Stuttgart), WDR Rundfunkchor (Cologne), London Voices and the West Midlands Inclusive Choir. Also, she holds teaching and conducting positions at the University of Birmingham.