We report, for the first time to our knowledge, a radially polarized and passively Q-switched Yb-doped fiber laser. By using a ${\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}$ crystal as a saturable absorber and a photonic crystal grating as a polarization mirror, a radially polarized pulse is produced, which has $202\mathrm{W}$ of peak power, $75\mathrm{ns}$ duration, and ~92% polarization purity at a $56.6\mathrm{kHz}$ repetition rate. The Q-switched pulse with radial polarization from the fiber laser would facilitate numerous applications.