- Day of the victims of communist regime in Czech Republic
- Outbreak of Poznań 1956 protests in Poland
On 28 June 1956 a huge wave of protests of Polish workers against the government of the Polish People's Republic began.
- Assassination of Archduke Franz Ferdinand
type: anniversary location: Bosnia (Sarajevo)
On 28 June 1914 the Archduke Franz Ferdinand of Austria and his wife Sophie were shot dead in Sarajevo by Gavrilo Princip, a young Bosnian Serb probably associated with the movement called Young Bosnia.
The assassination was a spark which caused the outbreak of the First World War.