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We develop a direct electron beam (EB) writing technique to fabricate Bragg gratings in organic dye nanofibers of thiacyanine that propagate exciton polaritons (EPs) along the fibers. The scanning electron beam with elaborately optimized parameters “bleaches” the nanofibers with a 100-nm-scale spatial resolution, leading to variation in the refractive index on that scale. We demonstrate that the fabricated Bragg gratings, with a period number N = 40 and a period length Λ ranging from 150 to 200 nm, reflect propagating exciton polaritons with a reflectance of up to ∼0.7.