Alttoggenburg District () is a former district of the canton of St. Gallen in Switzerland. The district existed from its formation in 1831 until the canton's 14 districts () were reorganized into 8 constituencies () on January 1, 2003. When the district was formed, it was split apart from Untertoggenburg. Today, the area is within the constituency of Toggenburg.
Communities Alttoggenburg contained four communities. Of these, Kirchberg, Lütisburg, and Mosnang remain organized municipalities, while Bütschwil was merged with a neighboring community in 2013 to form Bütschwil-Ganterschwil.
Coat of Arms Community name Area (km²) Population (2002) Bütschwil 13.79 3,584 Kirchberg 42.59 7,875 Lütisburg 14.09 1,349 Mosnang 50.46 2,961 Total (4) 120.93 15,769
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See also Toggenburg Counts of Toggenburg, who historically ruled from Alt-Toggenburg Castle in Kirchberg