The recently published Elgar Companion to John Maynard Keynes (2019) is a major new contribution to Keynes scholarship, with 63 participants contributing 95 distinct entries, in 632 pages of text proper. This review essay provides an overview and assessment of the character and content of the work. It does so also via consideration of the question of Keynes’s key theoretical achievements; the relation between Keynes’s thought and the main currents of subsequent Keynesian economics; Keynes’s approach to policy vis-à-vis ‘Keynesian’ policy; and finally, the question as to what is of enduring validity and greatest importance in Keynes’s economics, for the future.