King Lear has an unusual performance history. It was significantly revised, by Shakespeare or others, between its first two publications and was then succeeded by an adaptation that softened the ending so that Lear and Cordelia survived. In our own times King Lear is performed around the world in productions that explore its relevance to contemporary political and environmental challenges. This edition offers a distinctive “extended” text, taking the later Folio as a starting point and adding the lines that appear only in the Quarto, distinguished by a light gray background. Variations in individual words that are of critical interest are recorded in the margin.