1671

Events 
 April – Battle of Saraighat. The Ahom general Lachit Borphukan defeated the Mughal forces on the outskirts of present-day Guwahati of then sovereign Assam.
 May 9 –  Thomas Blood, disguised as a clergyman, attempts to steal the Crown Jewels from the Tower of London. He is immediately caught because he is too drunk to run with the loot. He would later be condemned to death and then mysteriously pardoned and exiled by King Charles II.
 June 22 – Ottoman Empire declares war on Poland

 Births 
 April 21 - John Law, Scottish economist
 May 24 - Gian Gastone de' Medici, Grand Duke of Tuscany

Deaths
 June 11 - Yun Seon-do, Korean politician