Ridgway Robert Syers Christian Codner Lloyd (20 December 1842 – 1 June 1884) was an English physician and antiquary.
He was the son of Francis Brown Lloyd, a west country doctor, who afterwards took orders, by his wife Margaret, daughter of George Christian.
He held the position of house surgeon in the Peterborough Infirmary for three years, and in 1870 he bought a practice at St. Albans.
He died from typhoid fever at his house in Bricket Road, St. Albans, on 1 June 1884 and was buried in the abbey churchyard; he left a widow and one son.
He studied the history of the abbey of St. Albans, and was consulted by Mr. Henry Hucks Gibbs as to the restoration of the screen.