The inscription of Bragg gratings in chalcogenide ( ${\mathrm{As}}_2{\mathrm{Se}}_3$ ) wires with subwavelength diameter is proposed and demonstrated. A modified transverse holographic method employing He–Ne laser light at a wavelength of ${\lambda }_w=633\mathrm{nm}$ allows the writing of Bragg grating reflectors in the $1550\mathrm{nm}$ band. The gratings reach an extinction ratio of $40\mathrm{dB}$ in transmission and a negative photo-induced index change of $\mathrm{\Delta }n\sim {10}^{-2}$ . The inscription of Bragg gratings in chalcogenide microwires will enable the fabrication of new devices with applications in nonlinear optics and sensing in the near- to mid-IR region of wavelengths.