Lippo Vanni was an Italian painter of the 14th century, active in his native Siena.
His name first appears on the Guild in 1355. He was a miniaturist, and painted for the Spedale in 1344. In 1352 he executed a Coronation of the Virgin for the Biccherna. In 1359, together with Nello Betti, he executed some work in the Palazzo Pubblico, and in 1372 he painted an Annunciation for the cloisters of San Domenico at Siena, portions of which work still exist. The latest fact recorded of him is that in 1375 he received six gold florins and thirty-one soldi for painting the doors of the great crucifix in the cathedral of Siena.