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Giovanni Nanni, also Giovanni de' Ricamatori, better known as Giovanni da Udine (1487-1564), was an Italian painter and architect born in Udine. He should not be confused with Martino da Udine, otherwise known as Pellegrino da San Daniele (1467-1547).

As a student and assistant of Raphael, he was responsible for most of the "decorative" (i.e. non-narrative) elements of the major Raphaellesque projects in Rome, and he was a specialist in fresco and stucco grotesque decorations. These included the stucco work in the Loggia di Raffaello (Vatican, 1517-1519) and the heavy fruit-laden swags in the loggia di psiche in the Villa Farnesina. He also assisted in the construction of a few monumental fountains, which are now destroyed.

After the death of Raphael, da Udine continued to work on projects initiated by his master, namely the Villa Madama in Rome. He continued his work until the sack of Rome (1527) when he departed to work in Florence, where he worked on the stuccoes in Sagrestia Nuova in San Lorenzo, and Venice, where he worked on the stucco decoration in the Palazzo Grimani, around 1540.

In Udine, he worked as an architect on the Torre dell'Orologio (Clock-Tower) and the Fontana di Piazza Nuova (Piazza Nuova Fountain). In Cividale, he helped in the construction of Santa Maria dei Battuti.

He returned to Rome in 1560 to work on the third floor of the Logge Vaticane, and died in this city in 1564.