René Ressejac-Duparc (28 September 1880 – 19 April 1941) was a French footballer who played as a midfielder and who competed in the 1900 Olympic Games, winning a silver medal as a member of the USFSA team, which was primarily Club Français players.

[3][4] The biography in the book was compiled from research by Stéphane Gachet, who investigated unknown French Olympians ahead of the 2024 Olympic Games in Paris,[3] and who found genealogical records matching the footballer to René Ressejac-Duparc.

[8] On 29 April 1900, he started in the final of the 1900 Challenge International du Nord against Le Havre AC, scoring his side's second goal to tie the match and force extra-time in an eventual 2–3 loss.

[9] He then missed the final of the 1900 USFSA Football Championship on 6 May, which ended in another loss to Le Havre AC (0–1), partly because CF's "forward line was disorganized due to the absence of Duparc".

[21] With the referee getting lost in the game, the play turned brutal, mostly perpetrated by Standard, who targeted the CF midfielders; Bloch was kicked so hard in the stomach that he had to go off, while Duparc along with Louis Bach and Cuny were "badly hit"; Club Français wrote a letter of complaint to the football association.

[22] Duparc's misfortune continued; when travelling to compete in another match in January 1901, a group called la bande noire burgled him, taking his shoes and bag.