Newdigate was born in Arbury, Warwickshire, the son of Sir Richard Newdigate, 3rd Baronet (who died in 1727) and inherited the title 5th Baronet and the estates of Arbury and of Harefield in Middlesex on the early death of his brother in 1734. He was educated at Westminster School and University College, Oxford, and contributed greatly to the university throughout the remainder of his life. He is most remembered as the founder of the Newdigate Prize on his death and as a collector of antiques, a number of which he donated to the University. The prize for poetry helped make the names of many illustrious writers.
He married, firstly Sophia Conyers in 1743, and secondly Hesther Margaret Munday in 1776. Both marriages were childless and on his death in 1806 the baronetcy became extinct. Arbury Hall and Harefield passed to Francis Parker (1774 – 1862) of Kirk Hallam, Derbyshire, a distant cousin of the 5th Baronet, who then adopted the additional name of Newdigate. Francis Parker moved into Arbury Hall and married Lady Barbara Maria Legge, daughter of George Legge, 3rd Earl of Dartmouth in 1820.
- Chisholm, Hugh, ed. (1911). "Newdigate, Sir Roger". Encyclopædia Britannica (11th ed.). Cambridge University Press.
- Foster, Joseph. "Alumni oxonienses: the members of the University of Oxford, 1715-1886". University of Oxford.
- "Encyclopædia Britannica, Newdigate Prize". Britannica.com. Retrieved 2012-04-17.
- "NEWDIGATE, Sir Roger, 5th Bt. (1719-1806), of Arbury, Warws. and Harefield, Mdx." History of Parliament Online. Retrieved 3 December 2017.
- Cooke, George Willis. George Eliot: A Critical Study of her Life, Writings and Philosophy. Whitefish: Kessinger, 2004. 
|Parliament of Great Britain|
Sir Hugh Smithson, Bt
|Member of Parliament for Middlesex
With: Sir Hugh Smithson, Bt
Sir Hugh Smithson, Bt
Sir William Beauchamp-Proctor, Bt
|Member of Parliament for Oxford University
With: Peregrine Palmer 1751–1762
Sir Walter Bagot, Bt 1762–1768
Sir William Dolben, Bt 1768
Francis Page 1768–1780
Sir William Dolben, Bt
|Baronetage of England|
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