République continued in service as a training vessel after the war; on 1 July 1919 she was formally assigned to the school of armorers and gunners. On 2 October 1919, she went into drydock to have her main battery turrets removed, and her 164.7 mm casemate guns were also removed, though she retained the secondary turret guns. As more modern battleships were withdrawn from service in the postwar reduction in force, they displaced République. On 9 December 1920, the battleship took her place in the gunnery school. République was decommissioned on 21 May 1921 and stricken from the naval register on 29 June. In November, she was taken to Savona, Italy, where she was broken up for scrap.
