March 6 – Jules Vandenpeereboom, 17th Prime Minister of Belgium (b. 1843) March 8 – Ferdinand von Zeppelin, German general and inventor (b. 1838) March 14 - Robert Viren, Imperial Russian Navy admiral (b. 1857) March 17 – Franz Brentano, German philosopher, psychologist (b. 1838) March 29 – Maximilian von Prittwitz, German general (b. 1848) March 31 – Emil von Behring, German winner of the Nobel Prize in Physiology or Medicine (b. 1854) April–June April 1 – Scott Joplin, African-American ragtime composer, pianist (b. c.1868) April 3 – Milton Wright, American bishop, father of the Wright brothers (b. 1828) April 6 – Prince Friedrich Karl of Prussia (b. 1893) April 7 – George Brown, British missionary (b. 1835) April 8 – Richard Olney, American politician (b. 1835) April 13 – Diamond Jim Brady, American businessman and philanthropist (b. 1856) April 14 – L. L. Zamenhof, Polish creator of Esperanto (b. 1859) April 18 – F. C. Burnand, British playwright and comic writer (b. 1836) April 29 – Tehaapapa III, Tahitian queen (b. 1879) May 7 – Albert Ball, British World War I fighter ace, posthumous Victoria Cross recipient (killed in action) (b. 1896) May 17 Charles Brooke, Rajah of Sarawak (b. 1829) Radomir Putnik, Serbian field marshal (b. 1847) May 18 – John Nevil Maskelyne, English magician and inventor (b. 1839) May 20 – Philipp von Ferrary, Italian stamp collector (b. 1850) May 23 – Queen Ranavalona III of Madagascar (b. 1855) May 24 – Les Darcy, Australian boxer (b. 1895) May 25 Maksim Bahdanovič, Belarusian poet (b. 1891) René Dorme, French World War I fighter ace (b. 1894) May 27 – Yevgeni Ivanovich Alekseyev, Imperial Russian Navy admiral and politician (b. 1843) May 29 – Kate Harrington, American teacher, writer and poet (b. 1831) June 3 – Matilda Carse, Irish-born American businesswoman, social reformer (b. 1835) June 5 – Karl Emil Schäfer, German World War I fighter ace (killed in action) (b. 1891) June 12 – Teresa Carreño, Venezuelan pianist, singer, composer and conductor (b. 1853) June 14 – Thomas W. Benoist, American aviator, aircraft designer and manufacturer, founder of the worlds first scheduled airline (b. 1874) June 15 – Kristian Birkeland, Norwegian physicist (b. 1867) June 17 – José Manuel Pando, 25th President of Bolivia (b. 1849) June 18 – Titu Maiorescu, Romanian politician, 23rd Prime Minister of Romania (b. 1840) June 26 – Ella Giles Ruddy, American