  Searches for physics beyond the Standard Model have been performed in
high-energy $e^{\pm}p$ collisions at HERA. No significant deviation from the
Standard Model has been observed while searching for contact interactions,
extra dimensions, leptoquarks, R-parity violating squarks and excited fermions.
Exclusion limits have been inferred which extend or complement bounds from
other colliders. The H1 collaboration has observed a puzzling excess of events
with an high $P_t$ isolated lepton and missing transverse momentum, and
interpretation as flavour changing neutral currents has been explored.
