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| Year | Name / Event | Description |
|---|---|---|
| 01-06-1855 | Adventure | The American adventurer William Walker conquers Nicaragua. |
| 01-07-1855 | Quinault Treaty | Signing of the Quinault Treaty: The Quinault and the Quileute cede their land to the United States. |
| 01-08-1855 | Monte Rosa | The first ascent of Monte Rosa, the second highest summit in the Alps. |
| 02-03-1855 | Alexander II of Russia | Alexander II becomes Tsar of Russia. |
| 03-05-1855 | William Walker (filibuster) | American adventurer William Walker departs from San Francisco with about 60 men to conquer Nicaragua. |
| 03-09-1855 | American Indian Wars | American Indian Wars: In Nebraska, 700 soldiers under United States General William S. Harney avenge the Grattan massacre by attacking a Sioux village and killing 100 men, women and children. |
| 04-06-1855 | Henry C. Wayne | Major Henry C. Wayne departs New York aboard the USS Supply to procure camels to establish the U.S. Camel Corps. |
| 04-07-1855 | Walt Whitman | The first edition of Walt Whitman's book of poems, Leaves of Grass, is published in Brooklyn. |
| 08-09-1855 | Crimean War | Crimean War: The French assault the tower of Malakoff, leading to the capture of Sevastopol. |
| 09-08-1855 | Åland War | Åland War: The Battle of Suomenlinna begins. |
| 09-09-1855 | Crimean War | Crimean War: The Siege of Sevastopol comes to an end when Russian forces abandon the city. |
| 11-02-1855 | Tewodros II | Kassa Hailu is crowned Tewodros II, Emperor of Ethiopia. |
| 11-11-1855 | 1855 Edo earthquake | A powerful earthquake occurs in Edo, Japan, causing considerable damage in the Kantō region from the shaking and subsequent fires. It had a death toll of 7,000–10,000 people and destroyed around 14,000 buildings. |
| 13-06-1855 | Giuseppe Verdi | Twentieth opera of Giuseppe Verdi, Les vêpres siciliennes ("The Sicilian Vespers"), is premiered in Paris. |
| 14-02-1855 | Texas | Texas is linked by telegraph to the rest of the United States, with the completion of a connection between New Orleans and Marshall, Texas. |
| 16-11-1855 | David Livingstone | David Livingstone becomes the first European to see the Victoria Falls in what is now Zambia-Zimbabwe. |
| 22-11-1855 | Birmingham | In Birmingham, England, Albert, Prince Consort lays the foundation stone of the Birmingham and Midland Institute. |
| 26-01-1855 | Point No Point Treaty | Point No Point Treaty is signed in Washington Territory. |
| 28-01-1855 | Panama Canal Railway | A locomotive on the Panama Canal Railway runs from the Atlantic Ocean to the Pacific Ocean for the first time. |
| 28-06-1855 | Sigma Chi | Sigma Chi fraternity is founded in North America. |
| 29-09-1855 | Port of Iloilo | The Philippine port of Iloilo is opened to world trade by the Spanish administration. |
| 30-03-1855 | Origins of the American Civil War | Origins of the American Civil War: "Border Ruffians" from Missouri invade Kansas and force election of a pro-slavery legislature. |
