Alsunga (also Alšvanga, German: Alschwangen) is a village in Alsunga Municipality, Latvia. Alsunga is the center of the Suiti people – a small Catholic community in the Lutheran western part of Latvia. There are approximately 940 inhabitants in Alsunga.
Alsunga was first mentioned in 1230, as an old settlement of Curonians. In 1372, a castle was built for the vogt of Kuldīga komtur. In 1561 Alsunga became the part of the predominantly Lutheran Duchy of Courland and Semigallia. In 1567 the Saint Michael church was built. In 1623 the local land owner, Johan Ulrich von Schwerin, in order to marry a Polish court lady Barbara Konarska, agreed to become Catholic. After the marriage he lived in Lithuania and Poland until 1632, when he returned to Alsunga after his father’s death. In 1634 Johan Ulrich invited Jesuits to establish a mission in Alsunga to help him transfer all his peasants to Catholic faith.
On October 1, 2009, the Suiti cultural space was included in the UNESCO List of Intangible Cultural Heritage in Need of Urgent Safeguarding.