He was educated at Eton College and Merton College, Oxford. After matriculation he was elected a Fellow of Exeter College, Oxford. Mackarness was ordained on Sunday May 18 1845.He was Vicar of St BartholomewTardebigge (1845–1855); Rector of Honiton (1855–1870) and finally Bishop of Oxford (1870–1889). He gave an annual prize for religious instruction at the Oxford Military College in Cowley and Oxford Oxfordshire from 1876 to 1896.
Personal life 
Mackarness's parents were John Mackarness and Catherine Poynter Coxhead. He married Alethea Buchanan Coleridge on 7 August 1849 at Ottery Saint Mary, Devon. She was born in 1826 in London and died on 30 March 1909. Her parents were the Right Honourable Sir John Taylor Coleridge and Mary Buchanan. Together they had eight children; one of whom was Frederick Michael Coleridge Mackarness a prominent barrister then judge who also served as the Liberal MP for the Newbury constituency between 1906 and 1910.
|Church of England titles|
|Bishop of Oxford
- University Intelligence.The Times (London, England), Wednesday, Dec 15, 1869; pg. 5; Issue 26621.
- FUNERAL OF BISHOP MACKARNESS The Hampshire Advertiser (Southampton, England), Wednesday, September 25, 1889; pg. ; Issue 4517
- "A History of Eton College" Cust,L.H: London, Duckworth & Co., 1899
- Alumni Oxonienses: the Members of the University of Oxford, 1715-1886: Their Parentage, Birthplace, and Year of Birth, with a Record of Their Degrees: Labouchere-Ryves Volume 3 p188
- ORDINATIONSThe Morning Post (London, England), Monday, May 19, 1845; pg. 3; Issue 23196
- W. P. Courtney, John Mackarness, Oxford Dictionary of National Biography, 2004. doi:10.1093/ref:odnb/17547
- "The Clergy List, Clerical Guide and Ecclesiastical Directory" London, Hamilton & Co 1889
- Lundy, Darryl. "Rt. Rev. John Fielder Mackarness". The Peerage.[unreliable source].
- Mrs. Mackarness The Times (London, England), Wednesday, Mar 31, 1909; pg. 13; Issue 38921.
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