Gilbert Louis Dupré Sr. (September 20, 1858 – December 18, 1946), was a self-educated lawyer and state representative from Opelousas, Louisiana, known for his initial political opposition to Governor Huey Pierce Long Jr. He held his state House seat from 1913 to 1932. A native of St. Landry Parish in South Louisiana, he maintained his legal office for many years in Opelousas.
Dupré was born into an established French-American family, the son of Lucius Jacques Dupré (1822–1869) and the former Caroline Victoire Vanhille (1826–1896). His great-grandfather, Jacques Dupré, was a pioneer of St. Landry Parish who served as a National Republican governor of Louisiana from 1830 to 1831 and in the Louisiana State Senate during the 1830s and 1840s. Gilbert was only ten when his father, Lucius, who was a law graduate of the University of Virginia and a member of the former Confederate Congress, died. There was no money for Gilbert's education; so he was self-educated in the law while he worked first in the office of the St. Landry Parish clerk of court. He was admitted to the bar in 1880 and established his law office in Opelousas. In 1887, Dupré was a member of the Louisiana state militia and was on active duty at the time of a riot in Morgan City in St. Mary Parish. He was a member of the Masonic lodge, the Benevolent and Protective Order of Elks, and the Roman Catholic Church.
From 1888 to 1992 and again from 1913, to fill the seat vacated by A. H. Garland, who left the state, until 1932, Dupré was a Democratic member of the Louisiana House of Representatives. He served as a state district court judge by election from 1896 to 1900 and by appointment in 1914. He was elected judge in 1916, 1920, and 1924, while he also served in the part-time legislative post. Such dual office-holding is no longer permitted. Judge Dupré, as he was long known, was a member of the Louisiana Constitutional Convention of 1921. In his second stint in the legislature, his successors included his son-in-law, Felix Octave Pavy, a prominent St. Landry Parish physician and an uncle by marriage of Dr. Carl Weiss, the assassin of U.S. Senator Huey Pierce Long, Jr.
The editor of the former New Orleans Item referred to Representative Dupré's steadfast opposition to tax increases:
In 1881, Dupré married Julia B. Estilette (1860–1944) of Opelousas, the daughter of his law partner, E. D. Estilette. She was born in New Haven, Connecticut, where her father was attending Yale University. E. D. Estilette was a judge and in 1876 the Speaker of the Louisiana House of Representatives. The couple had four children, including twin daughters, a son, and a third daughter. He was a member of the Benevolent and Protective Order of Elks. Dupré outlived his wife by two years. They are interred along with other family members at the Myrtle Grove Cemetery in Opelousas.
To retaliate against Dupré, Long had a hole drilled in the roof directly above Dupre's office in the Old Louisiana State Capitol to punish Dupré for the lawmaker's opposition to a new capitol building. When he demanded that Governor Huey Long repair the problem at once, Long said that he would do so only if Dupré would vote for the planned new Louisiana State Capitol building, to be built in skyscraper format. When Dupré refused to commit his vote, Long told him, "Die, damn you, in the faith!" Long then noted that Dupré "was much amused and almost came over."