Events |

• 
  January 22 – Coup d'état in the Netherlands (Batavian Republic). Unitarian Democrat Pieter Vreede makes an end to the power of the parliament (with a conservative-moderate majority).


• 
  7 March – French forces invade the Papal States and establish the Roman Republic
  


• 
  April 7 – The Mississippi Territory is organized from territory from Georgia and South Carolina and is later twice made larger to include disputed land claimed by both the U.S. and Spain


• 
  April 26 – France leaves Geneva
  


• 
  May 24 – Irish nationalists start bloody rebellion against British occupation.


• 
  June 12 – French take Malta
  


• 
  June 12 – Coup d'état in the Netherlands (Batavian Republic). Moderates depose Pieter Vreede.


• 
  July 1 – Napoleon's troops land in Egypt
  


• 
  July 14 – The Alien and Sedition Acts become United States law making it a federal crime to write, publish, or utter false statements about the United States government
  


• 
  July 21 – Napoleon defeats Mameluke forces near the Pyramids


• 
  July 24 – Napoleon occupies Cairo
  


• 
  July 30 – Selim III defeats Napoleon in Egypt


• 
  July 31 – Second elections in the Netherlands (Batavian Republic). No general elections this time.


• 
  August 1 – Horatio Nelson defeats the French navy under Admiral Brueys at the Battle of the Nile. Nelson himself is injured on the head.


• 
  August 22 – French troops land at Killala in County Mayo to assist Irish rebellion.


• 
  September 18 – Lyrical Ballads published anonymously by Samuel Taylor Coleridge and William Wordsworth
  

• 
  Franz Xaver, Baron Von Zach, Scientific Editor, Astronomer, begins editing journals about navigation and the geographic positions of cities.


• 
  XYZ Affair in the U.S., followed by naval battles, but no war is declared.


• First mechanical music boxes
  


• 
  Alessandro Volta and La Place discover electricity


• The Afghans Army occupied Lahore in Punjab
  


• 
  Aarau is the temporary capital of the Helvetic Republic
  


• 
  Alois Senefelder invents lithography
  


• 
  Eli Whitney contracts with the US Federal Government for 10,000 rifles, which he produces with interchangeable parts
  


• Charles Brockden Brown publishes the first American Novel Wieland or The Transformation an American Tale
  

Ongoing events |

• 
  French Revolution (1789-1799) Revolutionary Wars (1792-1802)-Second Coalition/Egyptian Campaign


• 
  May-October – Irish Rebellion of 1798
  

Births

for more information, see Category:1798 births.

Deaths

for more information, see Category:1798 deaths.