Sir Gawain and the Green Knight is a masterpiece of medieval English literature and one of the finest Arthurian tales in any language. Though its ingenious plotting and verbal artistry continue to dazzle readers, it is written in a challenging regional dialect and uses many words that were already archaic when the poem was written in the late fourteenth century. This edition is designed to make the poem, in its original Middle English, accessible to students and general readers. Following standards adopted for editing other Middle English poets, the edition lightly normalises spellings to make words more recognisable for a modern audience. Extensive marginal glossing of difficult words, thorough on-page explanatory notes, and a comprehensive glossary offer further support for readers. The historical appendices include other examples of medieval romance from France and Britain.