Sant'Andrea in Percussina is a frazione of San Casciano Val di Pesa in the province of Florence, Tuscany, Italy. It is a small village of ancient origin and one of the most picturesque places in the area between San Casciano Val di Pesa and Florence. Niccolò Machiavelli wrote his treatise The Prince at his home here, the Albergaccio, where he lived when in exile.