- Jun 1 John Quincy Marr, US Confederate captain, dies in battle at Fairfax Courthouse, the first Confederate death of the war at 36
- Jun 3 Stephen A. Douglas, American politician, US senator from Illinois (Lincoln-Douglas debates), dies at 48
- Jun 5 John Garland, US Union colonel and brigadier general, dies in battle
- Jun 5 Tomás Genovés y Lapetra Spanish opera and zarzuela composer (The Abduction), dies at 55
- Jun 6 Count Camillo Benso di Cavour, Italian politician who advocated for unification (First Prime Minister of Italy 1861), dies at 50
- Jun 6 Giuseppe Concone, Italian singing teacher, dies at 59
- Jun 25 Abdulmejid I, 31st Sultan of Ottoman Empire, dies at 38
Elizabeth Barrett Browning (1806-1861)
Jun 29 British poet and writer ("How Do I Love thee"), dies at 55
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide