Leiston Abbey outside the town of Leiston, Suffolk, England, was a religious house of Canons Regular following the Premonstratensian rule, dedicated to St Mary. Founded in c. 1183 by Ranulf de Glanville, Chief Justiciar to King Henry II (1180-1189), it was originally built on a marshland isle near the sea, and was called "St Mary de Insula". Around 1363 the abbey suffered so much from flooding that a new site was chosen and it was rebuilt further inland for its patron, Robert de Ufford, 1st Earl of Suffolk (1298-1369). However, there was a great fire in c. 1379 and further rebuilding was necessary.

The Order of Canons Regular of Prémontré, also known as the Premonstratensians, the Norbertines and, in Britain and Ireland, as the White Canons, is a religious order of canons regular of the Catholic Church founded in Prémontré near Laon in 1120 by Norbert of Xanten, who later became Archbishop of Magdeburg. Premonstratensians are designated by OPraem following their name.