  We consider the production of high energy neutrinos and cosmic rays in
radio-quiet active galactic nuclei (AGN) or in the central regions of
radio-loud AGN. We use a model in which acceleration of protons takes place at
a shock in an accretion flow onto a supermassive black hole, and follow the
cascade that results from interactions of the accelerated protons in the AGN
environment. We use our results to estimate the diffuse high energy neutrino
intensity and cosmic ray intensity due to AGN. We discuss our results in the
context of high energy neutrino telescopes under construction, and measurements
of the cosmic ray composition in the region of the ``knee'' in the energy
spectrum at $\sim 10^7$ GeV.
