  The properties of outflows powered by massive stars are reviewed with an
emphasis on the nearest examples, Orion and Cepheus-A. The Orion OMC1 outflow
may have been powered by the dynamical decay of a non-hierarchical massive star
system that resulted in the ejection of the BN object, and poossibly radio
soruces I and n from the OMC1 core. This interaction must have produced at
least one massive binary whose gravitational binding energy ejected the stars
and powered the outflow. A specific model for the coupling of this energy to
the gas is proposed. The radio source HW2 in the Cep-A region appears to drive
a pulsed, precessing jet that may be powered by a moderate-mass companion in an
eccentric and inclined orbit. This configuration may be the result of binary
formation by capture. These outflows demonstrate that dynamical interactions
among massive stars are an important feature of massive star formation.
