The earliest mention of Vadokliai can be found in the
Livonian Chronicle. 18th century sources mention Vadokliai manor, which was owned by the Belazaras family in 1726. In 1781, the lord of the manor, Anupras Belazaras helped to construct the church of Vadokliai. A primary school of
Saulė Society was opened in 1908. Before the
First World War, Vadokliai had a watermill, book bindery, bakery shops and flax processing companies. In 1919, during the
Lithuanian Wars of Independence, fights against the Bolsheviks took place near Vadokliai. Fallen Lithuanian volunteers were interred in the town's cemetery. During the
interwar period, Vadokliai was the centre of
valsčius. It had a police station, a healthcare centre and a retirement home. In 1928, a memorial was built to people who died for Lithuania's independence. After the
Second World War,
Lithuanian partisans were active around Vadokliai. There is a memorial stone erected for partisans, who were killed during the
anti-Soviet resistance near Vadokliai. On October 29, 2006, another monument for Lithuanian partisans was unveiled. On August 12, 2008, the town's coat of arms was officially accepted by the President of Lithuania. ==Demographics==