Jandun (French pronunciation: [ʒɑ̃dœ̃]) is a commune in the Ardennes department in northern France.

"Romy" mineral water is produced here.

Historical population

Year	Pop.	±%
1962	219	—
1968	230	+5.0%
1975	206	−10.4%
1982	230	+11.7%
1990	242	+5.2%
1999	235	−2.9%
2008	276	+17.4%
2012	285	+3.3%

• The church, Notre-Dame de Jandun, dates from the 12th and 13th centuries. It has 19th century frescoes, a Baroque altar and some sculpted capitals. Stained glass and statues decorate the interior.
• In the grounds of the church is a sculpted stone cross, classified as a monument historique in 1963 by the French Ministry of Culture.

• 
  Notre-Dame church
• 
  Fresco of Saint Fiacre
• 
  Statues of Saint Fiacre
• 
  The Baroque altar
• 
  Sculpted cross

• Jean de Jandun (circa 1285–1323) was a French philosopher, theologian, and political writer.
• The Duhan family, lords of part of Jaudun :
  • Jean Duhan, counsellor to the king.
  • Jacques Égide du Han (1685–1746), also known as Jacques Égide Duhan de Jandun, Huguenot soldier who served for twelve years as tutor to Frederick the Great.
• Émile Bourquelot, born in Jandun on 21 June 1851, chemist and professor of pharmacy.

• Communes of the Ardennes department