Montague Thomas Robson Younger (1836-1899) was an Australian church musician. He was the first organist of St Andrew's Cathedral, Sydney and has been described as "the first native of Sydney to reach eminence as an organist".
Montague Younger was born in Sydney on 25 June 1836, the third son of Charles Younger, an ironmonger, and his wife Harriett, née Mills. Charles Younger was organist at St Thomas's Church, North Sydney and a founding member of the Sydney Philharmonic Society in 1854. Montague attended a private school at Surry Hills conducted by Rev. Thomas L. Dodd. and took music lessons from Stephen Marsh and later from C. S. Packer. At the age of 12 years he succeeded his father as organist at St Thomas's, and also served as organist at St Peter's Church, Cook's River.
Younger became a partner in his father's firm, Younger and Son, ironmongers, until 1865. On 26 October 1865 he was married to Anna Maria Reilly at St Peter's Church. In 1865 the couple moved to Ipswich in Queensland, where Younger was appointed organist of St Paul's Church and director of the local Philharmonic Society. In 1868 Younger became the first organist of the newly opened St Andrew's Cathedral, in which post he served for over thirty years. Younger became vice-warden of the Sydney College of Music and was chairman of the committee for the specifications of the organ in the Sydney Town Hall. He an influential music teacher one of his pupils, Arthur Mason occupying the post of City of Sydney Organist. Younger was a judge at the Sydney International Exhibition in 1879-80.
Younger died of broncho-pneumonia at Ashfield on 26 December 1899. He was buried in the cemetery of St Thomas's, North Sydney and a memorial plaque was erected in St Andrew's Cathedral.