Ex Cathedra ( EKS-kə-THAY-drə) is a leading British choir and early music ensemble based in Birmingham in the West Midlands, England. It performs choral music spanning the 15th to 21st centuries, and regularly commissions new works.

Ex Cathedra was founded in Birmingham in 1969 by Jeffrey Skidmore OBE, its artistic director and conductor. It comprises a chamber choir of about 40 singers, a specialist vocal Consort made up of ten professional singers who feature regularly as soloists, and a Baroque ensemble/orchestra. It is known for its passion for seeking out the best, the unfamiliar and the unexpected in the choral repertoire and for giving dynamic performances underpinned by detailed research.

Each year, the choir presents a season of diverse programmes in a variety of venues in and around Birmingham, across the Midlands and in London. It has been a resident ensemble at Birmingham Town Hall Symphony Hall since 2007. Since 2014 has made regular appearances at Hereford Cathedral, St Peter's Collegiate Church in Wolverhampton, Southwell Minster and St James the Greater in Leicester.

Ex Cathedra has been invited to perform in concert series and festivals across the UK and as far afield as Israel and New York, including the BBC Proms where it performed Stockhausen in 2013, the Barbican Centre, Brighton Early Music Festival, Cheltenham Music Festival, Edinburgh International Festival, Kilkenny Festival, Lichfield Festival, London Festival of Baroque Music, Spitalfields Festival, St David's Festival, Three Choirs Festival and York Early Music Festival. The group has also appeared at festivals in Belgium, Finland, France, (Germany), Israel, Italy and Spain.

Ex Cathedra has collaborated with Fretwork (music group), the City Musick, His Majestys Sagbutts & Cornetts, Concerto Palatino, Birmingham Opera Company, Sinfonia New York, Birmingham Royal Ballet, the City of Birmingham Symphony Orchestra, Quebecois dance company Cas Public, the Shakespeare Institute, and the Shakespeare Birthplace Trust.

The first period instrument orchestra to be established in an English regional city, Ex Cathedra's Baroque Orchestra was founded as part of the choir's 1983–1984 season and made its début with a performance of Bach's Mass in B Minor. Comprising the UK's leading period instrumentalists, the orchestra's principals regularly give master classes and coach students at the Birmingham Conservatoire as part of its early music programme.