Gerolamo Mengozzi Colonna (1688 – Venice, 27 October 1774) was an Italian painter, mostly of frescoed quadratura.
Born in Ferrara, Gerolamo was a pupil of the painters of architectural perspective painters Antonio Felice Ferrari and Francesco Scala in Emilia-Romagna. He moved to Venice by 1716, where he began collaborations that spanned over four decades with Giovanni Battista Tiepolo and his son Giandomenico.
By 1716, he signs a contract with Mattia Bortoloni to decorate in fresco the Villa Cornaro in Piombino Dese for the patrician Andrea Cornaro. It is presumed that the two latter artists collaborated in decorating the octagonal room of the Villa Morosini Vendramin Calergi in Fiesso Umbertiano.
Mengozzi's first collaboration with Tiepolo was the decoration of the hall on the first floor (1719-1720) of the Villa Baglioni in Massanzago, depicting the Myth of Phaeton on the walls and the Triumph of Aurora on the ceiling. This was followed by the Apotheosis of Santa Teresa (1724-1725) in the vault of a chapel of the church of Santa Maria degli Scalzi. He also collaborated with Tiepolo in paintings for the church of the Cappucini in the sestiere of Castello. The products of these collaborations featured Mengozzi in the quadratura or painted architectural vistas, and Tiepolo painting the figures.
In 1726, he worked with Tiepolo in the gallery of the archbishop's palace and the Chapel of the Holy Sacrament in the Cathedral of Udine. This work was commissioned by the patrician Dionisio Dolfin. The frescoed scenes of Dream of Jacob, Sacrifice of Isaac, Hagar in the Desert, Rachel and the Idols, Abraham and the Angels, and Sarah and the Angel were all completed in collaboration with Mengozzi