Orazio Lomi Gentileschi (; 1563 – 7 February 1639) was an Italian painter. Born in Tuscany, he began his career in Rome, painting in a Mannerist style, much of his work consisting of painting the figures within the decorative schemes of other artists.

After 1600, he came under the influence of the more naturalistic style of Caravaggio. He received important commissions in Fabriano and Genoa before moving to Paris to the court of Marie de' Medici. He spent the last part of his life at the court of Charles I of England and died in London. He was the father of the painter Artemisia Gentileschi.

Life

Gentileschi was born in Tuscany, the son of a Florentine goldsmith called Giovanni Battista Lomi, and baptised at Pisa on 9 July 1563. He later took the name Gentileschi from an uncle with whom he lived after moving to Rome in either 1576 or 1578. His two older brothers Baccio and Aurelio Lomi were also painters.

Early years in Rome

Much of Gentileschi's early work in Rome was collaborative in nature. He painted the figures for Agostino Tassi's landscapes in the Palazzo Rospigliosi, and possibly in the great hall of the Quirinal Palace, although some authorities ascribe the figures there to Giovanni Lanfranco. He also worked in the churches of Santa Maria Maggiore, San Nicola in Carcere, Santa Maria della Pace, and San Giovanni in Laterano.

Influence of Caravaggio

thumb|350px|[[Danaë (Orazio Gentileschi)|Danaë by Orazio Gentileschi. 1621-1623, Oil on canvas, 161.5 × 227.1 cm (63 9/16 × 89 7/16 in.)]]

From around 1600, Gentileschi's style was transformed by his contact with Caravaggio After Caravaggio's flight from Rome, Gentileschi developed a more personal Tuscan lyricism, characterized by lighter colours and precision in detail, reminiscent of his Mannerist beginnings.

In 1611, Gentileschi collaborated with Tassi again, on works including the decorations of the Casino delle Muse. However, their association ended due to a dispute over money. In 1612 he was again called to the Tribunal of Rome, this time to speak against Tassi, who was charged with the rape of his daughter Artemisia Gentileschi.

Details of Gentileschi's studio practice during this period have been preserved in the records of Tassi's trial. Following Caravaggio's lead, he often painted directly from models.

Gentileschi died in London on 7 February 1639, and was buried in the Queen's Chapel at Somerset House.