The authors report a Moessbauer effect in FeCl//3-doped poly(N-methyl-2,5-pyrrolylene). The spectra indicate the presence of two distinct types of iron compounds. One of them has a lower Debye temperature and is not observed in the spectrum at 300 K. At 5 K, the large quadrupole doublet splits into six lines arising from the magnetic hyperfine interaction. The Moessbauer parameters best-fitted by the least squares method are summarized.