  We consider the three-loop corrections to the static potential which are
induced by a closed fermion loop. For the reduction of the occurring integrals
a combination of the Gr\"obner and Laporta algorithm has been used and the
evaluation of the master integrals has been performed with the help of the
Mellin-Barnes technique. The fermionic three-loop corrections amount to 2% of
the tree-level result for top quarks, 8% for bottom quarks and 27% for the
charm quark system.
