Rahel Ava Indermaur (born 19 July 1980) is a Swiss opera singer and dramatic soprano.

[2][3] Indermaur trained under Grace Bumbry, Marc Tucker, Charlotte Lehmann, David Lee Brewer, and Jean Ronald LaFond.

She has performed throughout Europe at the Palau de la Música de València,[6] Chamber Opera Leipzig, the Music Theatre Hamburg, the Sorbian National Theatre, the Konstanz Theater, the Teatro Principal in Palma de Mallorca, the Deutsche Oper Berlin, the Chorin Opera Festival, the Berliner Philharmonie, the Tonhalle St. Gallen, the Tonhalle Zürich, the Berlin Chamber Orchestra, the South West Philharmonic, the Lower Silesian Philharmonic, the Dubrovnik Symphony Orchestra, the Antalya Chamber Orchestra, the Brandenburger Bachist, and the Konstanz Chamber Orchestra.

[6] In 2014 Indermaur released a classical album, Stimmen im salon: romantische gesangsduette, with Nastassja Nass and Kevin McCutcheon, performing works by Felix Mendelssohn.

On 1 May 2016, she performed, alongside soprano Szabina Schnöller, tenor Ricardo Marinello, baritone Äneas Humm, and pianist Kevin McCutcheon at the concert Belle Voci: Highlights From Operas and Operettas, held at the Evangelical Church in Berneck.