The following are the baseball events of the year 1870 throughout the world.
This article is currently under construction.
Champions
- National Association of Base Ball Players: Chicago White Stockings, albeit disputed by Mutual of New York
Events
- June 14 - After 84 consecutive wins since assembling the first professional team in winter 1869, the Cincinnati Red Stockings lose 8-7 to the Brooklyn Atlantics before a crowd of 20,000 at the Capitoline Grounds. Bob Ferguson scores the winning run in the 11th inning on a hit by pitcher George Zettlein.
- July 23 - The visiting Mutuals of New York defeat the Chicago White Stockings 9-0 before 5,000 spectators at Dexter Park. The shutout pitched by Rynie Wolters is the first against any NABBP championship contender, inspiring Chicago (verb) and Chicago game as lingo for shutout through the 1890s.
- July 27 - The Red Stockings lose at home for the first time in their professional era, dropping an 11-7 decision to the Athletics of Philadelphia.
- November 21 - President Bonte recommends that the Cincinnati Base Ball Club not employ a professional nine for 1871, for that will be too expensive. The club officially dissolves that winter.
Births
- January 5 - Bill Dahlen (d. 1950)
- January 16 - Jimmy Collins (d. 1943)
- February 14 - Candy LaChance
- February 14 - Bob Quinn
- March 15 - Jimmy "Doc" Casey
- April 9 - Ollie Pickering
- July 31 - Joe Sugden (d. 1959)
- August 23 - George Davis (d. 1940) (death not publicly known until 1968)
- September 22 - Mike "Doc" Powers
- October 22 - Kid Carsey
- November 23 - Socks Seybold
- November 28 - Heinie Peitz
- November 30 - Frank Killen
- December 31 - Tommy Connolly (d. 1961)
- Silk O'Loughlin
