Harley MS. 7334, sometimes known as the Harley Manuscript, is a mediaeval manuscript of Chaucer's Canterbury Tales held in the Harleian Collection of the British Library.
It was formerly used as a base text for modern editions of the Tales, following the examples of Thomas Wright, who used it as the basis for his 1847 edition, and W. W. Skeat, who felt it gave authoritative variant readings.
The Harley MS. was likely produced in a London workshop within a decade of Chaucer's death, and is therefore one of the earliest extant manuscripts. It has some decoration in red, blue, pink and green, with gold leaf used on borders and initials, and like the Ellesmere Manuscript represents a commission for a wealthy patron (the style of the decoration is very similar to that seen in Ellesmere, perhaps indicating that the same limner worked on both). In the fifteenth century it appears to have been owned by relatives of the Haute family of Ightham Mote.
The scribe of Harley 7334, conventionally referred to as "Scribe D", is known to have been responsible for several other important manuscripts of the period, including eight copies of the Confessio Amantis of John Gower and one of Piers Plowman. He is also known to be responsible for one other manuscript of the Tales, Corpus Christi College MS. 198, and his work appears in a Gower manuscript alongside that of Adam Pinkhurst, now identified as the scribe of the Ellesmere MS. Scribe D was active in London between the 1390s and 1420s, though his spellings indicate that he was originally from the southwest Midlands. Academic Jeremy Smith has characterised Scribe D as particularly interesting, as his texts display a history in which he moved to London from north Worcestershire, tried hard to eliminate his Worcestershire dialect from his copying, and gradually assimilated peculiar spellings particular to Gower, eventually transplanting them into his work on Chaucer's texts.