John Murdoch (9 October 1796 – 15 December 1865) was a Roman Catholic bishop who served as the Vicar Apostolic of the Western District of Scotland.
Instead he was appointed the Coadjutor Vicar Apostolic of the Western District and Titular Bishop of Castabala by the Holy See on 4 June 1833.
In 1834, Bishop Scott moved to Greenock giving the charge of the whole of Glasgow to Murdoch.
His first task was to handle the debt with which St Andrew's Church was burdened which was finally paid off after five years.
His coadjutor, Bishop Smith, died in June 1861 and was replaced by John Gray.