The Mo¨ssbauer resonances of nitrogen‐matrix‐isolated57Fe and119Sn atoms have isomer shifts, which are within the experimental errors, identical with the isomer shifts of the same atoms isolated in rare‐gas matrices. Despite an observed quadrupole splitting of the57Fe and119Sn resonances, the relatively small photoelectric cross section of nitrogen makes the nitrogen matrix useful for matrix‐isolation Mo¨ssbauer studies of nuclei which require relatively thick Mo¨ssbauer absorbers.