  MAGIC currently is the largest imaging atmospheric Cerenkov telescope
world-wide. Since 2004, gamma-ray emission from several active galactic nuclei
in the GeV/TeV energy range has been detected, some of which were newly
discovered as very-high energy gamma-ray sources. The gamma-rays are assumed to
originate from particle acceleration processes in the AGN jets. We give an
overview of the AGN observed and detected by MAGIC, discuss spectral and
temporal properties of these and show physics implications of some selected
observations.
