He studied in his youth in Bologna, and was active as a diplomat, serving as ambassador to the Holy See and to Savoy; he also served as the Procurator of St Mark's for a time.

He was succeeded as Doge by Alvise Giovanni Mocenigo.

Foscarini was elected Fellow of the Royal Society in 1759, as a 'nobleman of distinguished learning and merit'.

[1] Liceo classico Marco Foscarini, a school in Venice, was named after him to honour his History of Venetian literature.

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