Late July – France-backed Sweden declares war on Russia, initiating the Russo-Swedish War (1741–1743), aiming to recover territories lost in the Great Northern War.[6]
8 August – Sweden formally declares war on Russia following the murder of Swedish diplomatic courier Malcolm Sinclair.[7]
23 August – At the Battle of Villmanstrand, Russian forces under Field Marshal Peter von Lacy defeat the Swedish army at present-day Lappeenranta, Finland.[8]
6 December (N.S.) / 25 November (O.S.) – Elizabeth Petrovna stages a bloodless coup with the Preobrazhensky Regiment, deposes Ivan VI and Anna Leopoldovna, and is proclaimed Empress of Russia.[9]
12 December – The deposed regent Anna Leopoldovna, her husband Anthony Ulrich, and their children are imprisoned, initially at Riga and later at Dünamünde fortress.[10]
8 December – Vitus Bering, Danish-born explorer; died on Bering Island after his ship was wrecked. Modern research suggests he died of heart failure rather than scurvy.[12][13]