Richard Byfield (1598?–1664) was an English clergyman, Sabbatarian controversialist, member of the Westminster Assembly, and ejected minister.
In Michaelmas term 1615 he was entered either as servitor or batler at The Queen's College, Oxford.
He was curate or lecturer at Isleworth, probably during his brother's incumbency (i.e. before 8 September 1622), and had some other minor employments before being presented in 1627 by Sir Thomas Evelyn to the rectory of Long Ditton, Surrey.
He sat in the Westminster Assembly, but was not one of the divines nominated in the original ordinance of 12 June 1643, being appointed, perhaps through the influence of his nephew Adoniram Byfield, to fill the vacancy caused by the 1645 death of Daniel Featley.
In 1654 he was appointed one of the assistant commissioners for Surrey, under the ordinance of 29 June for the ejection of scandalous, &c. ministers and schoolmasters.