Harry Clément Ulrich Kessler (23 May 1868 – 30 November 1937) was an Anglo-German count, diplomat, writer, and patron of modern art. His diaries "Berlin in Lights" published in 1971 revealed anecdotes and details of the artistic and theatrical life in Europe, mostly in Germany, from the collapse of Germany at the end of World War I until his death in Lyon in 1937.