| January 1 | Netherlands Indies colony begins opium production |
| January 4 | Stanley Cup: Ottawa Silver 7 beat Winnipeg Rowing Club, 2 games to 1 |
| January 4 | Supreme Court rules Puerto Ricans cannot be denied admission to US |
| January 5 | -34 degrees F (-36.7 degrees C), River Vale, New Jersey (state record) |
| January 5 | -42 degrees F (-41.1 degrees C), Smethport, Pennsylvania (state record) |
| January 5 | England beat Australia at the MCG, Rhodes 7-56 and 8-68 |
| January 7 | Marconi Co establishes "CQD" as 1st International radio distress signal |
| January 8 | Pope Pius X banned low cut dresses in the presence of churchmen |
| January 11 | Herero people of South West Africa, now Namibia, begin uprising |
| January 12 | Southwest-Africa uprising under Samuel Maherero against German garison |
| January 17 | Anton Chekhov's "Cherry Orchard" opens at Moscow Art Theater |
| January 21 | Leos Janacek's opera "Jenufa," premieres in Brno |
| January 25 | 179 die in coal mine explosion at Cheswick, Pennsylvania |
| January 25 | J. M. Synge's "Ruders to the Sea," premieres in Dublin |
| January 28 | 1st college sports letters given to Seniors who played on University of Chicago's football team are awarded blankets with letter "C" on them |
| January 29 | 1st athletic letters given (University of Chicago football team) |
| January 31 | Bela Bartok's symphony "Kossuth," premieres |
| February 2 | U.S. blues singer Gertrude Pridgett marries comic William Rainey |
| February 4 | John Millington Synges "Well of Saints," premieres in Dublin |
| February 5 | American occupation of Cuba ends |
| February 6 | Russian-Japanese war began |
| February 7 | Baltimore catches fire (1500 buildings destroyed in 80 blocks) |
| February 8 | Russo-Japanese War begins |
| February 9 | Japan declares war on Russia |
| February 10 | Japan and Russia declares war after Japan's surprise attack on Russian fleet at Port Arthur disabled 7 Russian warships |
| February 17 | Giacomo Puccini's opera "Madama Butterfly," premieres in Milan |
| February 21 | National Ski Association forms in Ishpeming, Michigan |
| February 23 | U.S. acquired control of the Panama Canal Zone for $10 million |
| February 25 | J. M. Synge's "Riders to the Sea" opens at Irish National Theater Society |
| February 25 | Stanley Cup: Ottawa Silver 7 sweep Toronto Marlboroughs in 2 games |
| February 28 | Vincent d'Indy's 2nd Symphony in B, premieres |
| February 29 | Theodore Roosevelt, appoints 7 man committee to study Panama Canal |
| March 1 | England regains cricket Ashes taking a 3-1 series lead vs. Australia |
| March 2 | Gabriele d'Annunzio's "La figlia di Iorio," premieres in Milan |
| March 2 | "Official Playing Rules of Professional Base Ball Clubs" adopted |
| March 8 | Hugh Trumble takes a hat-trick in his final Test Cricket match |
| March 9 | Brandon's Lester Patrick becomes 1st hockey defenseman to score a goal |
| March 11 | Stanley Cup: Ottawa Silver 7 sweep Brandon Wheat Kings in 2 games |
| March 12 | 1st main line electric train in U.K. (Liverpool to Southport) |
| March 12 | Andrew Carnegie establishes Carnegie Hero Fund |
| March 13 | Bronze statue of Christ on Argentine-Chilian border dedicated |
| March 18 | 1st performance of Edward Elgar's "In the South (Alassio)" |
| April 8 | Great Britain and France sign Cordial Entente concerning colonial matter |
| April 13 | Battle at Oviumbo Africa: Herero's chase away German army |
| April 13 | Congress authorizes Lewis and Clark Expo $1 gold coin |
| April 14 | George Bernard Shaw's "Candida," premiered in London |
| April 18 | L'Humanite, under Jean Jaures begins publishing |
| April 19 | 8th Boston Marathon won by Michael Spring of New York in 2:38:04.4 |
| April 19 | Much of Toronto destroyed by fire |
| April 20 | George Bernard Shaw's "Candida," premieres in London |
| April 20 | Louisiana Purchase Exposition opens in St. Louis |
| April 21 | Ty Cobb makes his pro debut for Augusta (South Atlantic League) |
| April 23 | American Academy of Arts and Letters forms |
| April 25 | New York Yankee Jack Chesbro's 1st of 41 wins this year |
| April 26 | Bell Telephone Company of Antwerp Belgium forms |
| April 30 | Ice cream cone makes its debut |
| May 2 | 30th Kentucky Derby: Shorty Prior aboard Elwood wins in 2:08 |
| May 5 | Cy Young of Boston pitches perfect game against Philadelphia A's (3-0) |
| May 6 | American Lung Association holds its 1st meeting |
| May 7 | Flexible Flyer trademark registered |
| May 11 | Andrew Carnegie donates $1.5M to build a peace palace |
| May 14 | 1st Olympics in U.S. are held (St. Louis) |
| May 17 | Maurice Ravel's "Sheherazade," premieres in Paris |
| May 18 | American Ion Perdicaris kidnapped in Morocco |
| May 21 | Federation Internationale de Football Association (Soccer) forms in Paris |
| May 25 | 38th Belmont: George Odom aboard Delhi wins in 2:06.6 |
| May 27 | NL record of 5 stolen bases in a game (Dennis McGann, New York Giants) |
| May 28 | 29th Preakness: Eugene Hildebrand aboard Bryn Mawr wins in 1:44.2 |
| May 30 | Frank Chance gets hit by pitch 5 times in a doubleheader |
| June 2 | Professor Schron finds microbe that causes photosynthesis |
| June 6 | National Tuberculosis Association organized, Atlantic City, New Jersey |
| June 11 | Cub's Bob Wicker no-hits New York Giants, wins in 12th on 1 hitter, 1-0 |
| June 11 | German Lieutenant-general Lothar von Trotha lands in Swapokmund, SW-Africa |
| June 14 | Dutch troops occupies Kuto Reh, Sumatra, killing all inhabitants |
| June 15 | Side-wheeler "General Slocum" burns in New York's East River (1,031 die) |
| June 21 | Boston Herald tells of Red Sox trade "Dougherty as a Yankee," 1st known reference to New York club as Yankees (became Yankees in 1913) |
| June 28 | International Anti-Military Cooperation (IAMV) forms in Amsterdam |
| June 29 | 2 prehistoric bones found in Weerdingerveen, Drenthe |
| July 1 | 3rd modern Olympic games opens in St. Louis |
| July 5 | Giants 18-game winning streak ends as Phillies win 6-5 in 10 inn |
| July 9 | 10th U.S. Golf Open: Willie Anderson shoots a 303 at Glen View Club IL |
| July 15 | 1st Buddhist temple in U.S. forms, Los Angeles |
| July 16 | Islands of Manu'a group (Samoa) ceded to U.S. by their chiefs |
| July 19 | Dutch Premier Kuypers disbands 1st Chamber |
| July 21 | After 13 years, the 4,607-mile Trans-Siberian railway is completed |
| July 21 | Camille Jenatzy sets world auto speed record at 65.79 MPH |
| July 23 | Ice cream cone created by Charles E Menches during La Purchase Expo |
| August 3 | British journalist Francis Younghusband visits forbidden city Lhasa |
| August 7 | Train derailed on bridge in Eden Colorado during a flash flood, kills 96 |
| August 10 | Angelo G Roncalli (Pope John XXIII) becomes a priest. |
| August 10 | Dutch newspaper Volk fires gay journalist Jacob de Cock |
| August 10 | Japanese fleet defeat Russians off Port Arthur |
| August 10 | Yankees Jack Chesbro ends string of 30 consecutive complete games |
| August 11 | German-ltalian General Von Trotha defeats Herero in SW Africa |
| August 16 | New York City begins building Grand Central Station |
| August 17 | Boston's Jesse Tannehell no-hits Chicago White Sox, 6-0 |
| August 23 | Automobile tire chain patented |
| August 24 | 24th U.S. Mens Tennis: Holcombe Ward beats William Clothier (108 64 97) |
| August 24 | Field battle at Liao-Yang-200,000 Japanese against 150,000 Russian |
| August 25 | James J Jeffries TKOs Jack Munroe in 2 for heavyweight boxing title |
| August 29 | 3rd modern Olympic Games opens in St. Louis |
| August 30 | Thomas Hicks wins 3rd Olympics marathon (3:28:53.0) (40 km) |
| September 3 | St. Louis Olympics closes |
| September 4 | Dali Lama signs treaty allowing British commerce in Tibet |
| September 6 | Soccer team Rheden forms |
| September 9 | Boston Herald again refers to New York baseball club as Yankees, when it reports "Yankees take 2," Yankee name not official till 1913 |
| September 9 | Mounted police 1st used in New York City |
| September 15 | Wilbur Wright makes his 1st airplane flight |
| September 19 | General Nogi's assault on Port Arthur: 16,000 Japanese casualties |
| September 20 | George Ade's "College Widow," premieres in New York City |
| September 20 | Orville and Wilbur Wright fly a circle in their Flyer II |
| September 23 | Francis Younghusbands leaves Lhasa Tibet |
| September 25 | Charles Follis is 1st black to play pro football |
| September 26 | Charles Kleins "Music Master," premieres in New York City |
| September 26 | Earl Grey is named British governor-general of Canada |
| September 26 | GB Shaw's "How He Lied to Her Husband," premieres in New York City |
| September 28 | Woman arrested for smoking a cigarette in a car on 5th Avenue, New York City |
| September 29 | 1st monument honoring Spanish American War erected (Monroeville Ohio) |
| September 30 | White Sox lefty Doc White, pitches his 5th shutout in 18 days |
| October 1 | JB van Heutsz becomes Governor-General of Netherland Indies |
| October 1 | Netherlands and Portugal lay down bounderies splitting Timor |
| October 3 | France and Spain sign treaty for Morocco Independence |
| October 3 | Giants Christy Mathewson strikes out then record 16 Cards |
| October 3 | Mary McLeod Bethune opens Daytona Normal and Industrial School |
| October 4 | 1st day of New York City subway, 350,000 people ride 9.1 mile tracks |
| October 7 | New York Highlander Jack Chesbro wins record 41st game of season (41-12) |
| October 8 | 1st Vanderbilt Cup auto race (Hicksville, Long Island, New York) |
| October 10 | Boston pitchers achieve 148 complete games-an AL record, also record for total complete games AL 1,098, NL 1,089 |
| October 10 | Liberty Theater opens at 234 W 42nd St. New York City |
| October 10 | Yankees 2 games out play 1st place Red Sox on final day doubleheader 41 game winner Chesbro loses 1st game and chance at pennant |
| October 16 | Russian Baltic fleet departs to Port Arthur |
| October 17 | Bank of Italy (Bank of America) opens its doors |
| October 18 | Mahlers 5th symphony premieres in Cologne |
| October 22 | Russian fleet shoots at British fishing ship |
| October 24 | 1st New York subway opens |
| October 27 | World's 1st subway, IRT (Interborough Rapid Transit), opens in New York City, subway/bus fare is set at one nickel (Brooklyn bridge-145 and Bdwy) |
| October 28 | St. Louis police try a new investigation method-fingerprints |
| October 29 | 1st intercity trucking service (Colorado City and Snyder, Texas) |
| October 29 | IRT (Interborough Rapid Transit) subway (New York City) opens |
| November 1 | George Bernard Shaws "John Bull's Other Island," premieres in London |
| November 2 | British newspaper, "Daily Mirror," begins publishing |
| November 4 | 1st stadium built specifically for football (Harvard Stadium) |
| November 8 | President Theodore Roosevelt (R) defeats Alton B Parker (D) |
| November 9 | 1st airplane flight to last more than 5 minutes |
| November 15 | King C Gillette patents Gillette razor blade |
| November 17 | George Cohans musical "Little Johnny Jones," premieres in New York City |
| November 23 | 3rd Olympic games close in St. Louis |
| November 28 | Germany defeats Hottentotten in Warmbad SW-Africa |
| December 6 | Theodore Roosevelt confirms Monroe-doctrine (Roosevelt Corollary) |
| December 10 | King Peter I of Sweden named nationalist regime |
| December 12 | CMS McClellans "Leah Kleschna," premieres in New York City |
| December 19 | Dawson City hockey team begins 9 day walk to get a boat to Seattle to catch a train to Ottawa to play in Stanley Cup on Jan 13 1905 |
| December 24 | German SW Africa abolishes slavery of young children |
| December 27 | Duke of York Theatre opens in London (1st musical Peter Pan) |
| December 27 | W B Yeats/Lady Gregory's "On Baile's Strand," premieres in Dublin |
| December 28 | 1st daily wireless weather forecasts published (London) |
