Giacomo Plezza (1806–1893) was an Italian politician.

Biography Appointed senator in 1848 by King Charles Albert, he was vice-president of the divisional council of Novara, president of the provincial council of Lomellina, mayor of Cergnago, and envoy extraordinary and minister plenipotentiary in the Kingdom of the Two Sicilies (December26, 1848May16, 1849).

He was the architect of important irrigation works in Lomellina; a canal irrigating vast areas in the provinces of Novara and Pavia bears his name.

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