This is a list of various things that took place in 1900.
Significant events
June
- Duncan McMillan and Jack O'Neill, two minor promoters based in Washington, form arguably the first promotional trust in Seattle.
Births
May
- 31 - Atholl Oakeley
- Ray Steele, born Peter Sauer in Norka, Russia
Debuts
June
- "The Russian Lion" George Hackenschmidt, a 4-year veteran of the amateur ranks, breaks into the pro game in London with a challenge directed specifically towards any British wrestler to meet him under Greco Roman rules.
Title changes
March
- March 21: Beck Olsen defeats Ernest Roeber in New York, NY to win the American Greco Roman title; Roeber had claimed the title since the retirement of William Muldoon in 1892.
- March 28: Beck Olsen defeats Ernest Roeber in a New York rematch to capture the European version of the Greco Roman championship, a title Roeber had claimed since 1894
September
- September 12: Ernest Roeber defeats Beck Olsen in Copenhagen, Denmark to regain the European Greco Roman title