  To further test MOdified Newtonian Dynamics (MOND) on galactic scales --
originally proposed to explain the rotation curves of disk galaxies without
dark matter -- we study a sample of six strong gravitational lensing early-type
galaxies from the CASTLES database. To determine whether dark matter is present
in these galaxies, we compare the total mass (from lensing) with the stellar
mass content (from a comparison of photometry and stellar population
synthesis). We find that strong gravitational lensing on galactic scales
requires a significant amount of dark matter, even within MOND. On such scales
a 2 eV neutrino cannot explain this excess matter -- in contrast with recent
claims to explain the lensing data of the bullet cluster. The presence of dark
matter is detected in regions with a higher acceleration than the
characteristic MONDian scale of $\sim 10^{-10}$m/s$^2$. This is a serious
challenge to MOND unless the proper treatment of lensing is qualitatively
different (possibly to be developed within a consistent theory such as TeVeS).
