1884

1884 (MDCCCLXXXIV) was a leap year starting on Tuesday of the Gregorian calendar and a leap year starting on Sunday of the Julian calendar, the 1884th year of the Common Era (CE) and Anno Domini (AD) designations, the 884th year of the 2nd millennium, the 84th year of the 19th century, and the 5th year of the 1880s decade. As of the start of 1884, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

• December 10 – Mark Twain's Adventures of Huckleberry Finn is first published, in London.

• May 8 – Harry S. Truman, thirty-third President of the United States (d. 1972)
• October 11 – Eleanor Roosevelt, First Lady of the United States, wife of Franklin D. Roosevelt (d. 1962)
• December 30 – Hideki Tōjō, 40th Prime Minister of Japan, Led the Attack on Pearl Harbour (d. 1948)

• January 25 – Johann Gottfried Piefke, German conductor and composer (b. 1815)
• March 21 – Ezra Abbot, American Bible scholar (b. 1819)
• April 4 – Marie Bashkirtseff, Russian artist (b. 1858)
• May 12 – Bedrich Smetana, Czech composer (b. 1824)
• May 13 – Cyrus McCormick, American inventor (b. 1809)
• June 25 – Hans Rott, Austrian composer (b. 1858)
• July 1 – Allan Pinkerton, American detective (b. 1819)
• July 10 – Paul Morphy, American chess player (b. 1837)
• November 25 – Adolph Wilhelm Hermann Kolbe, German chemist (b. 1818)