  Recent results from searches for new physics at HERA are reviewed. Exploiting
the uniqueness of lepton-hadron collisions at high energy, searches are
performed for electron-quark resonant states (leptoquarks or squarks in
R-parity-violating supersymmetry) or excited states of fermions. New phenomena
at a very high energy scale, manifested at present energies as effective
four-fermion contact interaction, are also investigated, including cases with
lepton-flavor violation. Finally, the status of events with a high-energy
lepton and missing transverse momentum is presented, resulting in the most
stringent constraint on the flavor-changing neutral current t-u-\gamma coupling
which could yield single-top production.
