  0957+561 is the first gravitational lens system to be discovered and first
for which a time delay was measured. Because the system is unusually rich in
observables such as image positions, fluxes, VLBI structure, and polarization
it has been modelled quite extensively. However, since it resides in a cluster
providing substantial convergence, the velocity dispersion of the lensing
galaxy is an important component to models. We have measured this dispersion to
be 288+/-9 kms (1-sigma), which implies a Hubble constant of 72+/-7 kms/Mpc
(1-sigma) according to the preferred FGS model of Grogin and Narayan, and
70+/-7 kms/Mpc (1-sigma) using the SPLS model. The unknown velocity dispersion
anisotropy of the central galaxy produces an additional uncertainty of perhaps
15% or more. We see no variation in dispersion with position to a radius of
+/-3". In addition to a galaxy from the background cluster at z=0.5, our slit
serendiptously picked up a galaxy at z = 0.448, and two galaxies which may be
part of a background cluster at a redshift of z=0.91.
