  We present analyses of deep radio observations of M83 taken with the Very
Large Array spanning fifteen years, including never before published
observations from 1990 and 1998. We report on the evolution of 55 individual
point sources, which include four of the six known historical supernovae in
this galaxy. A total of 10 sources have X-ray counterparts from a {\em Chandra}
survey. Each of these sources show non-thermal spectral indices, and most
appear to be X-ray supernova remnants. Comparing the radio source list to
surveys in optical and X-ray, we identify three optical/X-ray supernova
remnants. Nearly half of the detected radio sources in these observations are
coincident with known H II regions lying in the spiral arm structures of the
galaxy. We also report on changes in emission from the complex nuclear region,
which has shown variability at 20cm wavelengths. We confirm that the peak radio
emission from the nucleus is not coincident with the known optical center. One
lesser nuclear peak is consistent with the optical/IR nucleus. Previous
dynamical studies of a ``dark'' nuclear mass indicate a possible match to other
radio nuclear emission regions in M83.
