Henry III (French: Henri III, né Alexandre Édouard; Polish: Henryk Walezy; Lithuanian: Henrikas Valua; 19 September 1551 – 2 August 1589) was King of France from 1574 until his assassination in 1589 and, as Henry of Valois, King of Poland and Grand Duke of Lithuania from 1573 to 1575.
As the fourth son of King Henry II of France and Queen Catherine de' Medici, he was not expected to inherit the French throne and thus was a good candidate for the vacant throne of the Polish–Lithuanian Commonwealth, where he was elected monarch in 1573. During his brief rule, he refused to sign the Henrician Articles into law, which would recognise the szlachta's right to freely elect their monarch. The Henrician Articles became, nonetheless, deeply rooted in Poland's politics as all his successors accepted them. Aged 22, Henry abandoned Poland–Lithuania upon inheriting the French throne when his brother, Charles IX, died without issue.