The Republic of Alto Monferrato was a short lived partisan state existing from September to December 2, 1944.

The state came to exist following the political union of two Italian resistance movements based in Nizza Monferrato and Costigliole d'Asti of the southern Montferrat region.

[1] Its main territory comprised the towns of Moasca, San Marzano Oliveto, Calamandrana, Mombercelli, Bruno, Bergamasco, and Castelnuovo Belbo.

[2] The republic was left to a swift and violent end in Operation Koblenz-Süd, a roundup led by Nazi German troops and supported by Fascist Italy.

The Nazis quickly occupied Nizza Monferrato in December 2, de facto beheading the republic and rounding civilians suspected of supporting partisan forces.