(September 6, 1855, Philadelphia, Pennsylvania - January 5, 1919, Paris, France), was an American artist who spent his career in Paris. A contemporary of fellow expatriate painter John Singer Sargent, Stewart was nicknamed "the Parisian from Philadelphia."
His father, the sugar millionaire William Hood Stewart, moved the family to Paris in 1865, and became a distinguished art collector and an early patron of Fortuny and the Barbizon artists. Julius studied under Eduardo Zamacois as a teenager, under Jean-Leo Grôme at the École des Beaux Arts, and later was a pupil of Raymondo de Madrazo.
Stewart's family wealth enabled him to live a lush expatriate life and paint what he pleased, often large-scaled group portraits. The first of these, After the Wedding (1880), showed the artist's brother Charles and his bride Mae, daughter of financier Anthony J. Drexel, leaving for their honeymoon.