George Frederick Gilmore (1898–1985) was a Protestant Irish republican and communist who became an Irish Republican Army leader during the 1920s and 1930s. During his period of influence, Gilmore attempted to shift the IRA to the political left, but alongside Peadar O'Donnell and Frank Ryan he was expelled for his efforts. After leaving the IRA, Gilmore attempted to unite Irish republicanism under the banner of the Republican Congress, but ideological debates split the group apart. Afterwards, Gilmore removed himself from public life.